exam Maths Puzzle Numerical Ability

Use elimination to solve: 6x-y/4=-9
3x+2y=-30

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exam Other Question

A car rental compan has two rental rates. rate 1 is $72 per day plus $0.16 per mile. Rate 2 is $144 per day plus $0.08 per mile. If you plan to rent for one week, how many miles would you need to drive to pay less by taking rate 2? Please help me slove this equation
x-1=y