Substitution Method

The difference of 10 and a number

• n - 10

• 10 - n

• n x 10

• n/10

The product of 5 and a number

• 5/p

• 5p

• 5 - b

• 5 + b

The sum of a number and 11

• 11 - a

• a + 11

• 11 x a

• a/11

The quotient of 20 and a number

2 times the difference of 5 and a number

The quotient of 15 and 3 minus a number

• (15/3) - x

• 3/15 - x

• x - 15/3

• 15 x 3 - x

8n/4 (when n = 2)

(3+5)n (When n= 4)

7d -2d if d= 3

• 50

• 9d

• 15

• 75d

4(b + 2) if b=7

• 18

• 72

• 36

• 28