Q: Substitution method 2x plus 3y equals 13 x equals 2?

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If you mean: x+7y = 7 and 2x+y = 8 Then by substitution: x = 49/13 and y = 6/13

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5

273 13+8 = 21 and 13*21 = 273

The answer to the problem of 13 equals -4x plus 9 is x equals -1.

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(2,3)

5x+8 = 10x+35x-10x = 3-8-5x = -5x = 1 and by substituting the value of x into the equations y = 13

If you mean: x+7y = 7 and 2x+y = 8 Then by substitution: x = 49/13 and y = 6/13

If: x+y = 8 and 2x-y = 5 Then by adding the equations together: 3x = 13 or x = 13/3 By substitution into the original equations: x = 13/3 and y = 11/3

16

17

5

273 13+8 = 21 and 13*21 = 273

The answer to the problem of 13 equals -4x plus 9 is x equals -1.

yes it is

13+x=106 x+13=106 commutative property of addition x+13-13=106-13 additive property of equality x=93 substitution property

basically you asked what -28+21 which equals -7