Question

1. y varies directly with x, and y = 7 when x = 2. What is the value of y when x = 5?

Answer 1

1. y=mx where m is the constant

7/2 = y/5
2y = 35
y = 35/2
y = 17.5


2. y=mx where m is the constant

5=m4
m= 5/4
8=5/4 x
x= 6.4