exam Maths Puzzle Numerical Ability

Find two linear equations that have (4,6) as a solution?

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exam Other Question

Maximize z= 14x+22y subject to:
2x+2y> or equal to 20
8x+5y< or equal to 40
x> or equal to 0, y> or equal to 0
The linear programming has a what type of solution?
Can someone please help solve this problem.

(8x^3-20x^2-48x-18)/(4x+2)