Brianna solved a two-step equation, but she made a mistake along the way.
0.1x + 3 = 1.7
(-3) + 0.1x + 3 = 1.7 + (-3) Line 1
0.1x = -1.3 Line 2
(-0.1) + 0.1x = -1.3 + (-0.1) Line 3
x = -1.4 Line 4
What mistake did Brianna make?

Question

Brianna solved a two-step equation, but she made a mistake along the way.
0.1x + 3	= 1.7
(-3) + 0.1x + 3	= 1.7 + (-3)	Line 1
0.1x = -1.3	Line 2
(-0.1) + 0.1x	= -1.3 + (-0.1)	Line 3
x = -1.4	Line 4
What mistake did Brianna make?

aaronandyson · Answer

LINE 3 
Instead of dividing it 
i.e 
x = -1.3/0.1
he subtracted 0.1 on both sides.