Select the step in the solution that shows the first error. Step 1: 20x - 10 = 80 + 10x Step 2: 20x = 80 + 10x Step 3: 10x = 80 Step 4: x= 8
Mathematics · High School · Tue Nov 03 2020
llm
Answered on
So we have this equation:
20x - 10 = 80 + 10x
Put the variables on one side and the numbers on the other side. If a variable or number will change its sign from a + into a - and vice versa.
20x-10x=80+10
10x=90
Divide both sides with 10.
10x/10 = 90/10
x=9