I always found second setting that second equation up was hardest. How do I know which one comes first? You just keep them in the same order as the first math equation.
So let’s solve for x in terms of y: x - y = 25 x = 25 + y
Then substitute that into your first equation: x + y = 147 (25 + y) + y = 147 2y = 122 y = 61
