Substitution

If a = 2, calculate a + 7

• 5

• 9

• 6

If b = 7, calculate 6b

• 42

• 13

• 40

If c = 4, calculate 3c + 2

• 14

• 12

• 9

if a = 4 and b = 2, calculate a + b - 2

• 2

• 4

• 6

If x = 7, calculate x - 9

• -2

• 2

• 3

If b = 8, calculate -3b

• -11

• 24

• -24

If d = 11, calculate 3d - 7

• 26

• 22

• 33

If a = 2 and b = 4, calculate ab - 2b

• 0

• 2

• 4

If d = 5 and b = -3, calculate 3d²+ b

• 75

• 72

• 78

If d = -1 and b = -6, calculate db - b²

• -20

• 18

• -30