Direct Proportion Equation

y is directly proportional to x.

y = 9x

Find y when x = -2

• -11
• -18
• 0
• 5

p is directly proportional to q.

p = -0.5q

Find y when q = 18

• -6
• 0
• 27
• -9

y is directly proportional to x².

y = 2x².

Find y when x = 7

• 105
• 98
• 84
• 49

y is directly proportional to x.

y = 30 when x = 5

Find y when x = 7

• 14
• 21

• 32

• 42

m is directly proportional to n.

m = 10 when n =2

Find m when n = 5

• 25

• 10
• 15
• 20

t is directly proportional to the cube of r.

t = 4r³.

Find t when r = 2

• 32

• 16

• 8

• 64

• 27

• 9

• 3

• 81

• 18

• 9

• 6

• 12

• 32

• 16

• 8

• 64

• 9

• 3

• 27

• 81