If you mean: 2x+7y = -1 and 4x-3y = -19 then by substitution x = -4 and y = 1
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2x + 5 = 192x + 5 - 5 = 19-52x = 142x/2 = 14/2x = 7
If: y = x+6 and y = 2x Then: x+6 = 2x And: 6 = 2x-x => 6 = x So: x = 6 and y = 12
(2,3)
3x + 2x - 8x + 2x = -x
-2x + 6 + 22 = -2x + 28