Question

Does d = 4
a solution to the equation
28d + 15 = 25d +33?

Answer 1

28*4+15=25*4+ 33

Explanation:

112+15=100 +33

127=133

Answer 2

28d + 15 = 25d +33

Subtract 25d on both sides.

28d+15−25d=33

Combine 28d and −25d to get 3d.

3d+15=33

Subtract 15 from both sides.

3d=33−15

Subtract 15 from 33 to get 18.

3d=18

Divide both sides by 3.

d = 18/3

Divide 18 by 3 to get 6.

d=6

Is d = 4 a solution to the equation 28d + 15 = 25d +33?

Seeing as the answer is d=6, then the answer is not d=4. Therefore it is false.

Michael Spymore