exam Maths Puzzle Numerical Ability

how do you solve the linear system 6x+6y=-2 y=-x

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exam Other Question

Ace Auto Rental rents cars for $10 per day plus 10 cents per mile driven. Best Rental rents cars for $24 per day with unlimited mileage. How many miles per day can you drive an Ace solve each of the follwing systems by substitution.
5x-2y=-5
y-5x=3