so 3y - 3x = 4; 3(y - x) = 4; y - x = 1 and one third; infinte number of answers: eg y = 2 and one third, x = 1. Try y = 46 and a third, x = 45 Test -3 + 7 = 4 or -135 +139 =4 QED
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The slope is -1. 3x+3y=12 Subtract 3x 3y=-3x+12 Divide by 3 y=-x+4
(4, 5)
{-4,-5}
You need to organise your question properly. 3x+2y=4 4x + 3y= 7? Is 4 4x = 44x or 4-4x or 4+4x How can there be 2 equal signs in 1 equation?
If: -x-3y = -4 and 3x+5y = 16 Then: x = 7 and y = -1