How to answer it
- Name what x and y measure, with units.
- Read the slope as “y changes by this much per one x.”
- Read the intercept as the predicted y when x is 0, if that makes sense.
Worked example
An original question in the SAT format, already answered.
SAT MathWorked example
A scatterplot of hours studied (x) and quiz score (y) has the line of best fit y = 5x + 58.
Which choice best interprets the number 5 in this context?
- AEach additional hour of study is associated with about 5 more points.
- BA student who studies 0 hours scores about 5 points.
- CQuiz scores range from 5 to 58.
- DStudents study about 5 hours on average.
Answer: A. 5 is the slope: about 5 more points per extra hour. B describes the intercept, which here is 58.
The most common trap
Mixing up slope and intercept. The number multiplied by x is the rate.
Practice it
Hourly Prep’s daily sets mix two-variable data with the rest of SAT Math, and send more of it your way when it’s a weak spot. See how the SAT prep plan works, or browse the other SAT skill guides.
For pacing and strategy across the whole section, read our guide to Desmos on the SAT. To fit this skill into a schedule, see the SAT study plan guide.