exam Maths Puzzle Numerical Ability

Solve the system by addition. 5x - 3y = 13 4x - 3y = 11

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I need help with linear equations and ratio, and i dont understand any of it u put a linear equation and u see a bunch of numbers letters and brackets which is all a big blur to me Show how a test point for the inequality 3x+y >= 6 tells which side will be shaded. (Show the test point results and explain what that means)