exam Maths Puzzle Numerical Ability

solve the system using the linear combination method: 5x+y=6 -5x+3y=-22

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can you help me with setting up this problem and solve

find an equation of variation where y varies jointly as x and z and inversely as the square of w and y=20 when x=0.5, z=4, and w=5. What would the graph of the quadratic function {y=ax(7+3x),a is less than 0} look like?