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
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4x =20x=20/4x=5
y = 4x-3
5x + 20 = 4x +30 5x - 4x = 30 - 20 x = 10
2y = 4x + 4y = 2x + 2
8x + 10 = 3x +145x = 4x = 4/5 = 0.8Improved answer:8x+10 = 4x+148x-4x = 14-104x = 4x = 1