Question

Clare was solving an equation, but when she checked her answer she saw her solution was incorrect. She knows she made a mistake, but she can’t find it. Where is Clare's mistake?

Answer 1

Answer:

The Second Step.

Step-by-step explanation:

We have:

$12(5+2y)=4y-(5-9y)$

Here, Clare distributed both sides:

$72+24y=4y-5-9y$

There are two errors:

First, 12(5) is 60, not 72.

And when distributing the negative, we distribute it both terms. Hence, it will be 4y-5+9y and not what she obtained.