exam Maths Puzzle Numerical Ability

Which of the ordered pairs (3,1), (0,-4), (-4,0), (-3,-7) are solutions for the equation x-y=4?

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exam Other Question

An employee who produces x units per hour earns an hourly wage of y = 0.60x + 7 (in dollars). Find the hourly wage for an employee who produces 8 units per hour. please tell me if I have the correct solution to this problem I have to solve by graphing and find the solution
x-2y=8
3x-2y=12 this is what I got for the solution (0,6) (-2,0)