16Hit1600
AlgebraMediumCoefficient from a y-intercept

Algebra practice question

In the xy-plane, the graph of 4x + ky = 20 has a y-intercept of −5, where k is a constant. What is the value of k?

Answer: -4

At (0, −5), −5k = 20, so k = −4.

Common wrong answers

If you answered 4
4 has the sign wrong.
If you answered 5
5 uses the y-intercept as k.
If you answered -100
−100 multiplies 20 by −5 instead of dividing.

More Algebra questions

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