Question

Fx) varies directly with x and f(x) = 50 when x = -10, then what is f(x) when x = 15?

Answer 1

f(x)=-75

Explanation:

since f(x) varies directly with x

it implies that f(x)=Kx

k=f(x)/x

when f(x)=50 and x=-10

k=50/-10

k=-5

but when x=15, f(x)=-5×15

f(x)=-75