16Hit1600
AlgebraVery hardSum of the intercepts of a line

Algebra practice question

In the xy-plane, a line has slope −2 and x-intercept 5. What is the sum of its x-intercept and its y-intercept?

Answer: 15

y = −2(x − 5) = −2x + 10, so the y-intercept is 10 and the sum is 5 + 10 = 15.

Common wrong answers

If you answered 5
5 uses a y-intercept of 0.
If you answered 7
7 uses a y-intercept of 2.
If you answered -5
−5 gives the y-intercept the wrong sign.

More Algebra questions

Not affiliated with the College Board. SAT is a trademark of the College Board.