Erina12 please answe this i am on a live lesson

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15