Question

Kam is trying to find the solution to the system below. Her steps are below as well.

What did kam do wrong?

Answer 1

In step 4, she forgot to add 22 to 18

Explanation:

In step 4, she forgot to add 22 to 18

It should've been:

7x = 40

x = 40/7

3 (40/7) + 2y = 18

120/7 + 2y = 18

2y = 18 - 120/7

2y = 6/7

y = 3/7

Answer 2

Step 4

Explanation:

In step 4, instead of adding 22 to both sides of the equation to combine like terms, Kam got rid of it completely. Starting from step 3, here is the correct way of solving it:

`7x-22=18`

Add 22 to both sides

`7x-22+22=18+22\\7x=40`

Divide both sides by 7 to isolate x

`(7x)/(7)=(40)/(7) \\x=(40)/(7)`

I hope this helps!