First you must simplify the equation. 7t+(-3t) is equal to 4t. Then we subract 3y from 4t. This brings us to 4t-3y. We also can simplify the first equation. We can move 4t to 8t and we then get 8t-4t-3y which is equal to 4t-3y. We know that 4t-3y=4t-3y.
Hopw this helps. <3
