Alister Doyle, Math makes my head hurt.
Hey there, for this problem you want to use Substitution, where you you express y as a function of x. So if you take the first equation and re-write it as 2y = 8 - 4x, you can see that y = 4 - 2x (dividing by 2). You can then substitute this value of y into the second equation so that you have 5x - 3(4-2x) = 4. If you need more help here are some great videos on solving equations by substitution: