exam Maths Puzzle Numerical Ability

Find the values of x and y that solve the following system of equations

-5x-7y=-1

2x+9y=-12

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exam Other Question

the sum of two numbers is 13. One number is 1 more than twice the other.fIND THE LARGER NUMBER? Hi! I need some help to simplify and all exponents should be positive.

(2^-1a^2b)^-3
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4a^-9

and

(3x4y^3-5y)-(2x+3y^3-5y)