x = 3, y = -4
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If 5x plus 3y equals 13, the x equals 2 and y equals 1. This is because 5x2=10 and 3x1=3, and 10+3=13.
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273 13+8 = 21 and 13*21 = 273
The answer to the problem of 13 equals -4x plus 9 is x equals -1.
If you mean: x+7y = 7 and 2x+y = 8 Then by substitution: x = 49/13 and y = 6/13