Substitution Practice

Use x = 2, y = 3, z = 4. Show the new problem after replacing each variable with the correct number, under each problem, then solve the equation. Match the following:

• 23

• z + 21 =

• 25

• y + 21 =

• 24

• x + 21 =

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

15y =

• 15y = 15

• 15y = 30

• 15y = 45

• 15y = 60

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

5x + 9 =

Mathematical Equivalence

ON

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

y + 12 =

• y + 12 = 15

• y + 12 = 14

• y + 12 = 16

• y + 12 = 13

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

6x + 12 =

• 6x + 12 =

  6*2 + 12 =

  12 + 12 = 24

• 6x + 12 =

  6*2 + 12 =

  12 + 12 = 26

• 6x + 12 =

  6*2 + 12 =

  12 + 12 = 22

• 6x + 12 =

  6*2 + 12 =

  12 + 12 = 20

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

5z + y =

• 5z + y =

  5(4) + 3 =

  20 + 3 = 23

• 5z + y =

  5(4) + 3 =

  20 + 3 = 25

• 5z + y =

  5(4) + 3 =

  20 + 3 = 22

• 5z + y =

  5(4) + 3 =

  20 + 3 = 24

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

xz =

• xz = 2 * 4 = 8

• xz = 2 + 3 = 5

• xz = 2 4 = 24

• xz = 2 + 4 = 8

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

6x - z =

Mathematical Equivalence

ON

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

2z + 7 =

• 2z + 7 =

  2(4) + 7 =

  8 + 7 = 15

• 2z + 7 =

  2(4) + 7 =

  8 + 7 = 14

• 2z + 7 =

  2(4) + 7 =

  8 + 7 = 16

• 2z + 7 =

  2(4) + 7 =

  8 + 7 = 17

Use x = 2, y = 3, z = 4. Write the new problem under the existing one, then solve.

xz + 4 =

• 8

• 28

• 12

• 15