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payton:
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
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lowkey:
Look at the problem! What do you think is wrong
payton:
there are 2 y´s
payton:
on 3
lowkey:
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
payton:
thats what i thought
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