exam Maths Puzzle Numerical Ability

y-15=-4

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please help me solve these problems

3x+y=2
-x-3y=6 Im in algebra 1 and i am getting a c- in that class. I think that i can do the homework reall easily when we recieve it. But when i get my graded paper back, i end up in a big mud puddle. what can i do to get a better grade in math?