Question

Ernesto tried to determine the solution for the system of equations using substitution. His work is shown below.

x – y = 7

3x – 2y = 8

Step 1: x = y + 7
Step 2: 3(y + 7) – 2y = 8
Step 3: 3y + 7 – 2y = 8
Step 4: y + 7 = 8
Step 5: y = 1

In which step did Ernesto make the first error?

Step 1
Step 2
Step 3
Step 4

Answer 1

Look at the problem! What do you think is wrong

Answer 2

there are 2 y´s

Answer 3

on 3

Answer 4

That's alright for that! You are on the right track, the answer is 3.
Here's why. The person didn't distribute right. It should have been 3x+21 but he did it as 3x7

Answer 5

thats what i thought