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tankabanditka [31]
3 years ago
6

How can you solve y=3x+2 and -4x+2y=8 with substitution

Mathematics
2 answers:
seraphim [82]3 years ago
7 0
Well, I can't explain how to solve but the answer is (2,8)
Xelga [282]3 years ago
7 0
We have:

y=3x+2~~(i)\\\\ -4x+2y=8~~(ii)

Substituting (i) in (ii):

-4x+2y=8\\\\ -4x+2(3x+2)=8\\\\ -4x+6x+4=8\\\\ 2x+4=8\\\\ 2x=4\\\\ x=\dfrac{4}{2}\\\\ \boxed{x=2}

Using the value obtained above in the expression (i):

y=3x+2\\\\ y=3\cdot2+2\\\\ y=6+2\\\\ \boxed{y=8}
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