Does anyone know these 2 hard math questions?

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2 Emergency Math Questions..I dont know them?
Question 4 (10 points)Save


Write this problem down on a sheet of paper. You will need to use this to answer another question.

STEEL PROBLEM

There are two lengths of steel that total 30 ft in length. One piece is 4.5 ft longer than the other. Which system of equations would represent this situation if L = length of LONG piece and S = length of SHORT piece.
L - S = 4.5 and L = S + 30
L + S = 30 and L = S + 4.5
L + S = 30 and S = L + 4.5
L + S = 30 and L = S - 4.5

Question 5 (10 points)Save


Which of the following is the solution for Y in this system of equations ?

2X + Y = 18 and X - 2Y = 3
2
-7
7
-2