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Anonymous
2x-3y=13
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If you mean: x+7y = 7 and 2x+y = 8 Then by substitution: x = 49/13 and y = 6/13
16
5
273 13+8 = 21 and 13*21 = 273
The answer to the problem of 13 equals -4x plus 9 is x equals -1.