Question

If y varies directly with X and Y equals 21 when X equals 3 find Y if x =5

Answer 1

Answer: X = 5 and Y = 35

Explanation:

Y is 21 when x is 3. Divide both x and y by 3 giving you y=7 and x=1. Then multiply both sides by 5 giving you x=5 and y=35

Answer 2

35

Explanation:

y = k*x

21 = k*3

k = 7

x=5 .. y = 7 * 5 = 35