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i am guessing here that this is what you mean as it involves substitution:

2x-2y = 4

therefore -2y = 4 - 2x

Sub the above line into the first equation gives:

13x - 2x +4 = 70

11x = 66

x=6

then sub in x

13(6) - 2y = 70

78 - 2y = 70

y=4

Yep, this is the exact same as simultaneous equations

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โˆ™ 2012-08-06 22:49:10
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Q: What is the answer to 13x-2y equals 70 and 2x-2y equals 4 using the method of substitution?
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