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Originally Posted by xmichellex How do you solve 3x+y=-4
x=2/3y in substitution method |
all you have to do is in the first equation (or whichever one seems easier) put in what the second equation says x is equal to.
For your example, if you decide to use the first one as your "working" equation you would use the second one to substitute in for the x in the first equation.
so your working problem would then look like this:
3(2/3y) + y = -4 and now you can solve for y
Once you have the value for y, you then put that y-value into one of the equations (I always pick the one that will give me the easier math) and then you solve for x because that is the only variable!
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