book Maths Puzzle Numerical Ability

Please help me do this the cramer rule in math.

x + 3y z=-2
2x + 5y + z=-5
x + 2y +3z= 6

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book Other Question

Tech high school surveyed its freshmen and found that 3/4 of the freshmen own an iPod. If 240 freshmen have iPods, how many freshmen attend Tech High? Solve the system by graphing and state the coordinates of the solution in words:
x + y = 4 and -x + y = 2