16Hit1600
AlgebraHardInput that gives a target output

Algebra practice question

For the linear function k, k(0) = −4, and the graph of k passes through the point (6, 8). For what value of x is k(x) = 10?

Answer: 7

The slope is (8 − (−4))/6 = 2, so k(x) = 2x − 4, and 2x − 4 = 10 gives x = 7.

Common wrong answers

If you answered 3
3 solves 2x − 4 = 2.
If you answered 5
5 solves 2x = 10, forgetting the −4.
If you answered 8
8 is the y-value at x = 6, not the answer.

More Algebra questions

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