y = kx = f(x)
5 = k(20) <--- y=5 when x=20
Solves for k:
k = 5/20 = 1/4
So the function is
y = (1/4)x = f(x)
Part B:
f(8) = (1/4)*8 = 2, so y=2 when x=8
Rebekah H.
asked 04/13/20Suppose that y varies directly with x, and =y 5 when =x20.
Then it asks for:
(a): Write a direct variation equation that relates x and y.
(b): Find y when x=8
y= ____
y = kx = f(x)
5 = k(20) <--- y=5 when x=20
Solves for k:
k = 5/20 = 1/4
So the function is
y = (1/4)x = f(x)
Part B:
f(8) = (1/4)*8 = 2, so y=2 when x=8
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