A student solved the equation x + 2 (x + 1) = 17 below and showed their work in the table below.
Problema + 2(x + 1) = 17
Line 1
x + 2x + 2 = 17
Line 2 3x + 2 = 17
Line 3 3x = 15
Line 4 x =45
Identify the property used to arrive at Line 1.
Identify the property used to arrive at Line 2.
What line has a mistake?
What should have been the correct answer for that line?
The property used to arrive at Line 1 is the distributive property.
The property used to arrive at Line 2 is combining like terms.
Line 4 has a mistake.
The correct answer for line 4 should be x = 5.