How to Solve -x+2y=7

-x+2y=7

1) 2y = x + 7
2) y = x/2 + 7/2

Now all you have to do is plug in random numbers for x to find the value of y

To solve this you need 2 equations with x and y.
For example you should easy solve something like this, for x: 5x-2=13.
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Let's start: 5x-2=13[/*:m]

Add 2 to both sides: 5x-2+2=13+2 => 5x=15[/*:m]

Divide both sides by 5: 5x/5=15/5 => x=3[/*:m]

That's all![/*:m][/list:u]
Use the same methodology on the equations you want to solve and try to practise by searching on Google!
Dms