Question

If x varies directly as y, and x = 7 1/2 when y = 10, find x when y = 4.
direct variation?

Answer 1

x:y = 15/2: 10 = x: 4

10x = 30
x = 3

Answer 2

y = kx ← constant variation
4 = 8k
k = 4/8
k = ½

Finally.

y = x/2
y = ½ [If x = 1]

I hope this helps!

Answer 3

becca its the same as the circle diameter question.. see hafiz's solution above.!