Question 181746
x+y=4.......eq 1
y=2x+4......eq 2
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one reason substitution would work well here is because in eq 2, y is already isolated.
:
graphing could work but many times graphing is inaccurate in determining the exact solution.
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substitution is MUCH more reliable, although in graphing you get a visual picture of the system and can actually see the lines intersect.