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Divide the first by 3 and something magic may pop out.
I tried to teach you this yesterday and you refused to learn?
I did not refuse I just didn't get it
Well, @overtonka, I think @skullpatrol would be delighted to see you make a better effort, today. Divide the first equation by 3 and show what you get.
Super! Any suggestion what we should do next? Hint: I didn't have you divide by 3 just for fun.
solve for one of the variables?
Now what (hint: use the name of the method)
Since we are using substitition, that would be the things to do. Please abandon those silly-looking '1's. We don't usually write those unless we are trying to make a point.
ok so v-x=5?
No, why did you UNsolve? Please "solve for one of the variables".
so plug that in to the other equation?
Substitution principle: An expression maybe replaced by another expression that has the same value If $$a=b$$then b maybe substituted for a in any expression.
It's your big chance. Let's see the substitution!