SAT Math : Other Lines

Study concepts, example questions & explanations for SAT Math

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Example Questions

Example Question #21 : How To Find The Equation Of A Line

Find the equation of a line that goes through the points , and .

Possible Answers:

Correct answer:

Explanation:

For finding the equation of a line, we will be using point-slope form, which is

, where  is the slope, and  is a point. 

We will pick the point 

If we picked the point 

 

We get the same result

Example Question #151 : Coordinate Geometry

Find the equation of a line that passes through the point , and is parallel to the line .

Possible Answers:

Correct answer:

Explanation:

Since we want a line that is parallel, we will have the same slope as the line . We can use point slope form to create an equation.

, where  is the slope and  is a point.

Example Question #15 : How To Find The Equation Of A Line

Find the equation of the line shown in the graph below:

 

 Sat_math_164_05

 
Possible Answers:

y = 2x + 4

 y = -1/2x + 4

y = -1/2x - 4

y = x/2 + 4

Correct answer:

y = x/2 + 4

Explanation:

Based on the graph the y-intercept is 4. So we can eliminate choice y = x/2 - 4.

The graph is rising to the right which means our slope is positive, so we can eliminate choice y = -1/2x + 4.

Based on the line, if we start at (0,4) and go up 1 then 2 to the right we will be back on the line, meaning we have a slope of  (1/2).

Using the slope intercept formula we can plug in y= (1/2)x + 4.

 

 

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