exam Maths Puzzle Numerical Ability

evaluate the discriminant of the equation: y=-4x-4x-1

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Could someone please take the time to help me solve the question: Solve the following system of two linear equations by elimination: 3x - 4y = 13 and
3y + 2 x = 3.

Thank you, I really appreciate your help. Profit: A small appliance manufacturer finds that the profit P (in dollars) generated by producing x microwave ovens per week is given by the formula
P=1/10(x)(300-x) provided th