9x + 8y = (9 x 6) + (8 x 3) = 54 + 24 = 78
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9x+4 =x-7 8x=-3 x=-3/8
Multiply the first equation by 3 to give 9x + 15y = 21
9x + 5 = 4x + 3 Subtract 4x from both sides: 5x + 5 = 3 Subtract 5 from both sides: 5x = - 2 Divide both sides by 5: x = -2/5 or -0.4
9x - 3(x + 13y) = 9x - 3x - 39y = 6x - 39y = 3(2x - 13y)
(2x+3)(x+3)