Question

Zack used these steps to solve this equation: When Zack checked his solution, it didn't work. What was his mistake?

u+5-- -9
Step 1: y + 5- -9
Step 2: y = -14
Siep 3 ()y-4()
Step 4: y=-21
In step 1, he should have used the multiplication property of equality.
In step 2, he should havea constant of- 4 on the right side.
In step 3, he should have divided both sides by
n step4, the answer should be positive.

Answer 1

Zack's mistake occurred in step 1 of his equation solution. He should have used the addition property of equality instead of multiplication property of equality.

Step-by-step explanation:

The mistake in Zack's solution is that in step 1, he should have used the addition property of equality instead of multiplication property of equality. In step 2, he should have added -4 to both sides of the equation, not set it as a constant on the right side. In step 3, he should have divided both sides by y, not n. Finally, in step 4, the answer should be positive (+21) since y is positive.