Question

Solve each equation. Check your solution. 10z = 40

a.
z = 50
c.
z = 30
b.
z = 4
d.
z = 400

Answer 1

b. z = 4

Explanation:

Multiply both sides of the equation by 1/10. This gives ...

(1/10)·10z = (1/10)·40

z = 4 simplified

_____

Check

Putting 4 where z is in the original equation should give us a true algebraic expresion. It does.

10·4 = 40 true