80=4x, z=6x. find Z.
x=80/4, x=20.
z=6x20
z=120
answer= 120
y = 10x
4x= y
y = 3x y = 3*19 = 57
y is directly proportional to x. When y = 15, x = 3 therefore y = 5x When x = 12, then y = 5 x 12 = 60.
i think it would be like this: 4:25 :: 1:6.25
57
40
y = -5
y = 10x
4x= y
Find an equation of variation where y varies directly as x. One pair of values is y = 80 when x = 40
What is y? Fx varies with x, but y could be anything.
y = 8
25
Since r varies directly with s, we have r = ks (replace k with 5 and s with 7) r = (5)(7) r = 35
y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.
m = 24