Question

If y varies directly as x, what is the value of y in these ordered pairs? (1, 1) and (17, y)

Answer 1

y=kx
1=1*k so k =1
so
y = x
so
(17,17)

Answer 2

17

Answer 3

y=kx (y varies with x)
and we use the point (1,1) to find k
plug in y=1 and x = 1
y = kx becomes 1 = k*1 and so we know that k = 1
so
y=x
now the last pair is (17,y) and we know y = x = 17
so y = 17
thus (17,17)