Intermediate Geometry : Coordinate Geometry

Study concepts, example questions & explanations for Intermediate Geometry

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Example Questions

Example Question #1512 : Intermediate Geometry

Find the x-intercept(s) for the circle

Possible Answers:

The circle never intersects the x-axis

Correct answer:

Explanation:

The x-intercepts of any curve are the x-values where the curve is intersecting the x-axis. This happens when y = 0. To figure out these x-values, plug in 0 for y in the original equation and solve for x:

adding 0 or 0 square doesn't change the value

take the square root of both sides

this means there are two different potential values for x, and we will have to solve for both. First:

add 4 to both sides

Second: again, add 4 to both sides

Our two answers are and .

Example Question #5 : How To Find X Or Y Intercept

Give the coordinate pair(s) where  intersects with the y-axis.

Possible Answers:

and

The graph does not intersect with the y-axis.

Correct answer:

and

Explanation:

To find where the graph hits the y-axis, plug in 0 for x:

first evaluate 0 - 2 

then square -2

add 4 to both sides 

take the square root of both sides

now we have 2 potential solutions and need to solve for both

a)

b)

Example Question #7 : X And Y Intercept

Which is neither an x- or y-intercept for the parabola

Possible Answers:

Correct answer:

Explanation:

The y-intercept(s) occur where the graph intersects with the y-axis. This is where x=0, so we can find these y-values by plugging in 0 for x in the equation:

The x-intercept(s) occur where the graph intersects with the x-axis. This is where y=0, so we can find these x-values by plugging in 0 for y in the equation:

add 16 to both sides

take the square root

Example Question #11 : X And Y Intercept

What is the x-intercept of the line

Possible Answers:

Correct answer:

Explanation:

To determine the x-intercept, plug in  for , since the x-axis is where .

subtract  from both sides

multiply both sides by 

divide both sides by 

The x-intercept is

Example Question #231 : Coordinate Geometry

What is the x-intercept for the line ?

Possible Answers:

Correct answer:

Explanation:

To find the x-intercept, plug in  for , since the x-axis is where .

add  to both sides

divide both sides by 

Example Question #1521 : Intermediate Geometry

Find the y-intercept for the line

.

Possible Answers:

Correct answer:

Explanation:

To find the y-intercept, plug in 0 for x, since the y-axis is where x = 0.

subtract 24 from both sides

divide by -3

The y-intercept is

 

 

Example Question #11 : How To Find X Or Y Intercept

Find the x-intercept for the line

.

Possible Answers:

Correct answer:

Explanation:

To find the x-intercept, plug in 0 for y, since the x-axis is where y = 0

subtract 5 from both sides

multiply both sides by -3

The x-intercept is

Example Question #231 : Coordinate Geometry

What is the y intercept of the line :

Possible Answers:

Correct answer:

Explanation:

Here all we have to remember is that when given a linear equation to find the y-intercept, or where the line crosses the y-axis, we just need to set x=0 and solve for y.  This solution is shown below:

Example Question #16 : X And Y Intercept

A rocket is fired that follows the below parabolic path where h(t) represents the height (in feet) over time (in seconds). How much time did the rocket spend in the air? 

Possible Answers:

8 seconds

256 seconds

16 seconds

0 seconds

Correct answer:

16 seconds

Explanation:

To solve, you must find the zeros or x-intercepts for the function h(t). 

To find x-intercepts, we must plug in 0 for h(t). 

Factor to solve - divide by 16t. 

Set both parts equat to zero. 

     

The answer is t=16 because when t=0, that is when the rocket is first being fired from the ground, the rocket then returns to the ground after having spent 16 seconds in the air. 

 

Example Question #17 : X And Y Intercept

Find the y-intercept(s) for the circle given by the equation below: 

Possible Answers:

Correct answer:

Explanation:

To find the y-intercept for any equation, plug in 0 for x in the original equation. 

Simplify

Subtract 25 from both sides

Take the square root of both sides

Subtract 2 from both sides to get the y-intercept. 

This circle has one y-intercept. 

It is possible for a circle to have one y-intercept, two y-intercepts or no y-intercepts. 

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