2x + y = 7
3x - y = 8
You cannot find x and y using only one equations, but using both you can! So first you have use algebra to make both equations = y. Try this for the first equation by rearranging it.
This gives y =7 - 2x
Now again for the second equation.
This gives y = 3x - 8
Now, because we can make these two equations equal, because they are both equal to y!
This gives 7 - 2x = 3x - 8
Now solve for x.
This gives 15 = 5x, so x = 15/5 = 3
Now that we know x, all we have to do it put in the value of x into one of the equations and solve it to get y!
y = 7 - 2x = 7 - 2*3 = 7 -6
y= 1 !