x + 12 = 2x + 6
The 'answer' is the number that ' x ' must be
in order to make the statement true.
Subtract ' x ' from each side of the equation:
12 = x + 6
Subtract 6 from each side:
6 = x
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6 + 2x = x - 6 6 + x = -6 x = -12
12 = 2x + 6 subtract 6 from both sides 6 = 2x divide both sides by 2 3 = x
if: 2x + 6 = -6 then: 2x = -12 x = -6 if: 5x + 7y = 1 then: 5(-6) + 7y = 1 7y = 31 y = 31/7
They are parallel lines.
2x must equal 12 so x is 6.