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

tobin has 66 coins that are all pennies and nickels. the total amount of money she has is $2.38. howm many pennies and kickels does she have? Solve: 1.3y + 4.4 = 0.8y + 4.1