If y=kx, where k is a constant, and y=24 when x=6, what is the value of y when x=5?

Question

Answer choices:
A) $-6x-5$
B) $6x+5$
C) $6x-5$
D) $6x^2-15x$

I keep getting $y=20$ , but it's none of these choices

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Answer 1 · 2018-07-26T04:06:00

You're right

Solving for k,
y = kx
24 = k(6)
k = 4

Substitute in k and given x,
y = 4x = 4(5) = 20

Option A: $-6(5) - 5 = -35$
Option B: $6(5) + 5 = 35$
Option C: $6(5) - 5 = 25$
Option D: $6(5)^2 - 15(5) = 75$

None of the options is equal to 20 when x = 5.