Question

Select all the equations where z=5z=5z, equals, 5 is a solution.

Answer 1

Answer:

A, D and E

Step-by-step explanation:

A.

$8 = z + 3$

Subtract 3 from both sides

$8 -3 = z + 3-3$

$5 = z$

$z = 5$

B.

$z - 1 = 6$

Add 1 to both sides

$z - 1+1 = 6 + 1$

$z = 7$

C.

$20 = \frac{40}{z}$

Multiply through by z

$z * 20 = \frac{40}{z} * z$

$20z = 40$

Divide through by 20

$\frac{20z}{20} = \frac{40}{20}$

$z = 2$

D.

$12z = 60$

Divide through by 12

$z = 60/12$

$z = 5$

E

$12 + z = 17$

Subtract 12 from both sides

$-12 + 12 + z = 17 - 12$

$z = 5$

Hence:

A, D and E answers the question