book Maths Puzzle Numerical Ability

how do yuo solve proportions that have multiple variables

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Algebraic expression {{{bx^2-cx+a^2=0}}} the differ by the sign of the square root. what is the one with the plus sign? How would you solve a problem such as 3x-5y=-11 or x+2y=6
2x+y=-3 3x+y=8
algebraically? Also how would you write an equation of the lin