ISEE Lower Level Quantitative : How to find the points on a coordinate plane

Study concepts, example questions & explanations for ISEE Lower Level Quantitative

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Example Questions

Example Question #154 : Geometry

Which quadrant would (-3, -5) be in?

Images

Possible Answers:

I

III

IV

II

Correct answer:

III

Explanation:

Two negative points will always be found in Quadrant III.

Example Question #1 : How To Find The Points On A Coordinate Plane

Which coordinate point is closest to the \(\displaystyle \small x\)-axis? 

Possible Answers:

\(\displaystyle \small (4,1)\)

\(\displaystyle \small (1,2)\)

\(\displaystyle \small (-2,-3)\)

\(\displaystyle \small \small (0,2)\)

Correct answer:

\(\displaystyle \small (4,1)\)

Explanation:

Although coordinate point  \(\displaystyle \small (4,1)\) has the largest \(\displaystyle \small x\) value in comparison to the other answer choices--it is the closest point to the \(\displaystyle \small x\)-axis becaues of the points \(\displaystyle \small y\) value.

Compare the absolute value of each of the coordinate points \(\displaystyle \small y\) values. Since, the absolute value of point \(\displaystyle \small (4,1)\) is the lowest, the point has the shortest distance to the \(\displaystyle \small x\)-axis.

 

Example Question #2 : How To Find The Points On A Coordinate Plane

Select the point that has the shortest distance to the \(\displaystyle \small y\) axis. 

Possible Answers:

\(\displaystyle \small (2,7)\)

\(\displaystyle \small (-1,8)\)

\(\displaystyle \small (-5,0)\)

\(\displaystyle \small (2,4)\)

Correct answer:

\(\displaystyle \small (-1,8)\)

Explanation:

Since the \(\displaystyle \small y\)-axis runs vertically, the point that has the \(\displaystyle \small x\) coordinate with the lowest absolute value will be closest to the \(\displaystyle \small y\)-axis. Therefore, coordinate point \(\displaystyle \small (-1,8)\) has the shortest distance to the \(\displaystyle \small y\)-axis, because the point is only a distance of \(\displaystyle \small 1\) away from the \(\displaystyle \small y\)-axis. Every other coordinate point has an absolute distance of \(\displaystyle \small 2\) or more. 

Example Question #161 : Geometry

Which coordinate point is farthest from the \(\displaystyle \small x\)-axis? 

Possible Answers:

\(\displaystyle \small (-1,4)\)

\(\displaystyle \small (-5,5)\)

\(\displaystyle \small (5,-5)\)

\(\displaystyle \small (1,5)\)

\(\displaystyle \small (1,-7)\)

Correct answer:

\(\displaystyle \small (1,-7)\)

Explanation:

Compare the absolute value of each of the coordinate points \(\displaystyle \small y\) values. Since, the \(\displaystyle \small y\) value of point \(\displaystyle \small \small (1.-7)\) has the greatest absolute value, this point has the farthest distance to the horizontal \(\displaystyle \small x\)-axis.

Example Question #162 : Geometry

Find the equation of the line that passes through coordinate point \(\displaystyle \small (6,4)\).

Possible Answers:

\(\displaystyle \small y=\frac{3}{2}+5\)

\(\displaystyle \small y=\frac{2}{3}x-5\)

\(\displaystyle \small y=\frac{3}{2}x-5\)

\(\displaystyle \small y=\frac{2}{3}x+5\)

Correct answer:

\(\displaystyle \small y=\frac{3}{2}x-5\)

Explanation:

To find the equation of the line that passes through coordinate point \(\displaystyle \small (6,4)\), plug the \(\displaystyle \small x\) and \(\displaystyle \small y\) values into each equation. The correct equation will end with a true statement. 

The solution is:
\(\displaystyle \small x=6\)\(\displaystyle \small y=4\)


\(\displaystyle \small y=\frac{3}{2}x-5\)

\(\displaystyle \small 4=\frac{3}{2}(6)-5\)

\(\displaystyle \small 4=\frac{18}{2}-5\)

\(\displaystyle \small 4=9-5\)

\(\displaystyle \small 4=4\)

Example Question #163 : Geometry

Select the coordinate point with the farthest distance from the \(\displaystyle \small y\)-axis. 

Possible Answers:

\(\displaystyle \small (-6,2)\)

\(\displaystyle \small (5,8)\)

\(\displaystyle \small (4,9)\)

\(\displaystyle \small (8,-5)\)

\(\displaystyle \small (5,-8)\)

Correct answer:

\(\displaystyle \small (8,-5)\)

Explanation:

Since the \(\displaystyle \small y\)-axis runs vertically, the point that has the \(\displaystyle \small x\) coordinate with the greatest absolute value will be farthest from the \(\displaystyle \small y\)-axis. Therefore, coordinate point \(\displaystyle \small \small (8,-5)\) has the longest distance to the \(\displaystyle \small y\)-axis, because the point is a distance of \(\displaystyle \small 8\) away from the \(\displaystyle \small y\)-axis. Every other coordinate point has an absolute distance of \(\displaystyle \small \small 6\) or less. 

Example Question #164 : Geometry

The coordinate point \(\displaystyle \small (4,8)\)  is on the line represented by which of these linear expressions? 

Possible Answers:

\(\displaystyle \small y=-2x+8\)

\(\displaystyle \small y=2x\)

\(\displaystyle \small y=-2x\)

\(\displaystyle \small y=2x+8\)

Correct answer:

\(\displaystyle \small y=2x\)

Explanation:

To find the equation of the line that passes through coordinate point \(\displaystyle \small (4,8)\), plug the \(\displaystyle \small x\) and \(\displaystyle \small y\) values into each equation. The correct equation will end with a true statement. 

The solution is:
\(\displaystyle \small x=4\),\(\displaystyle \small y=8\)

\(\displaystyle \small y=2x\)
\(\displaystyle \small 8=2(4)\)
\(\displaystyle \small 8=8\)

Example Question #165 : Geometry

Which of the following points corresponds to \(\displaystyle (2, 2)\)?

1

Possible Answers:

\(\displaystyle C\)

\(\displaystyle D\)

\(\displaystyle B\)

\(\displaystyle A\)

Correct answer:

\(\displaystyle A\)

Explanation:

Recall that in a coordinate \(\displaystyle (x, y)\), the first number corresponds to how to move on the horizontal x-axis, and the second number corresponds to how to move on the veritcal y-axis.

Every time you see a positive number in the x-coordinate, you will move to the right. Every time you see a negative number in the x-coordinate, you will move to the left.

When you see a positive number in the y-coordinate, you will move up. When you see a negative number in the y-coordinate, you will move down.

To get to the point \(\displaystyle (2, 2)\), move \(\displaystyle 2\) units to the right on the x-axis, then move \(\displaystyle 2\) units up on the y-axis.

Example Question #166 : Geometry

Which of the following points corresponds to \(\displaystyle (-6, 2)\)?

2

Possible Answers:

\(\displaystyle A\)

\(\displaystyle C\)

\(\displaystyle B\)

\(\displaystyle D\)

Correct answer:

\(\displaystyle A\)

Explanation:

Recall that in a coordinate \(\displaystyle (x, y)\), the first number corresponds to how to move on the horizontal x-axis, and the second number corresponds to how to move on the veritcal y-axis.

Every time you see a positive number in the x-coordinate, you will move to the right. Every time you see a negative number in the x-coordinate, you will move to the left.

When you see a positive number in the y-coordinate, you will move up. When you see a negative number in the y-coordinate, you will move down.

To get to the point \(\displaystyle (-6, 2)\), move \(\displaystyle 6\) units to the left on the x-axis, then move \(\displaystyle 2\) units up on the y-axis.

Example Question #167 : Geometry

Which of the following points corresponds to \(\displaystyle (-12, -5)\)?

3

Possible Answers:

\(\displaystyle B\)

\(\displaystyle A\)

\(\displaystyle D\)

\(\displaystyle C\)

Correct answer:

\(\displaystyle B\)

Explanation:

Recall that in a coordinate \(\displaystyle (x, y)\), the first number corresponds to how to move on the horizontal x-axis, and the second number corresponds to how to move on the veritcal y-axis.

Every time you see a positive number in the x-coordinate, you will move to the right. Every time you see a negative number in the x-coordinate, you will move to the left.

When you see a positive number in the y-coordinate, you will move up. When you see a negative number in the y-coordinate, you will move down.

To get to the point \(\displaystyle (-12, -5)\), move \(\displaystyle 12\) units to the left on the x-axis, then move \(\displaystyle 5\) units down on the y-axis.

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