3x - 4 = 17
3x = 21 (add 4 to both sides)
x = 7 (divide both sides by 3)
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If: y = 3x+4 and y = 2-7x Then: 3x+4 = 2-7x So: 3x+7x = 2-4 => 10x = -2 => x = -1/5 By substitution: y = 17/5 Solution: x = -1/5 and y = 17/5
If: 3x+8-x = 5x-4 Then: x = 4
(4, 5)
x = -3, y = 7
-2 -3x = 10 Add 2 to both sides: - 3x = 12 Divide both sides by -3: x = -4