Question

if (m = 8) and (3m + 72 = 4y-56), then by the substitution property of equality, (3(8)+72 = 4y-)

Explanation:

Step1: Substitute m = 8 into 3m + 72

$3\times8+72=24 + 72=96$
So the equation becomes $96=4y - 56$

Answer:

56