3x + 4x = 84
7x = 84
divide both sides by 7
x = 12
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4x
3x - 7 + 4x = 28 7x - 7 = 28 I added 4x and 3x to get 7x 7x = 35 I subtracted 7 from both sides x = 5 I divided by 7 on both sides
y= -4x-7 y=3x 3x= -4x-7 3x+4x=7 7x=7 x=1
11
-1