(1) 5x + 2y = 20(2) x + 4y = 13Step 1: Eliminate x or y. We do this but making either the x or y terms the same, in this example, I will make the y terms the same, by multiplying the first equation by 2.(1) X 2 = 10x + 4y = 40. Let's call this equation (3).We can now take equation (2) away from (3). 10x + 4y = 40 _ x + 4y = 139x = 27Step 2: Divide both sides by 9 to get x on its own. x = 3.Step 3: Substitute x into equation (1) or (2). For example, if you substitute it into equation (2) you get: 3 + 4y = 13.Step 4: Rearrange to find y. 4y = 10 y = 2.5Step 5: Check your answer by substiting your values for x and y into equation (1) or (2).Equation 1: 5(3) + 2(2.5) = 20 15 + 5 = 20The left hand side equals the right hand side, so you have found x and y!