© 2007 M. Tallman

© 2007 M. Tallman

× 5

3x + 3 = 18

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

5 x =15 3x =

3x + 3 = 18

+ 3 = 183x+ 3 = 1815

= 1818

© 2007 M. Tallman

2x + 4 = ˉ6

× ˉ5

2x + 4 = ˉ6

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

ˉ5 x =ˉ10 2x =

+ 4 = ˉ62x+ 4 = ˉ6ˉ10

= ˉ6ˉ6

© 2007 M. Tallman

+ 3 = 7 + 3 = 7x5

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

x = 204

+ 3 = 7= 77

=

x5

+ 3 = 7x520

4

x5

© 2007 M. Tallman

× 5

11x + 2 = 57

11x =

11x + 2 = 57

x

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

5 x =

55

+ 2 = 5711+ 2 = 5755

= 5757

© 2007 M. Tallman

w3

30

3 = - 7w33 = - 7w3

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

30 = w10

- 73 =33 =

= w3

3 = - 710

© 2007 M. Tallman

× 4

3 + 8x = 35

3 + 8x = 35

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

4 x =32 8x =

3 + 8

= 3535

x= 35323 + = 35

© 2007 M. Tallman

20 =20 = 3

20 = 3x - 720 = 3x - 7

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

= x 9= 3x 27

2020 =27× 9- 7x

- 7

© 2007 M. Tallman

210z

2 = - 3z22 = - 3z2

You can use the “cover-up method” to solve for the unknown.

Step 2:

What number has to be under your finger to make this equation true?.Step 3:

Use substitution to check your work.

Step 1:

Cover up the unknown.

10 = z5

- 32 =22 =

= z2

2 = - 35