y=x/7
y=(1/7) x
It is a direct variation since it is of the form y=kx, where k=1/7 , a constant
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20/21
xy = K so K = 21
If P varies directly with q, r and s then P = kqrs, where k is a constant. As 70 = k x 7 x 5 x 4 = 140k : k = 70/140 = 1/2 The equation of joint variation is P = ½qrs.
d = -196
x = 7 7-4/3 x 7 = 1/7 3/21 = 1/7