All SAT Math Resources
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 .
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 .
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:
y = 2x + 4
y = -1/2x + 4
y = -1/2x - 4
y = x/2 + 4
y = x/2 + 4
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.