exam Maths Puzzle Numerical Ability

10x + 2y = 7
y = -5x + 3

If someone could help me with this problem please.

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exam Other Question

A certain experimental drug causes a decrease in blood pressure modeled by
D(X) = .4x^3 - 3x, where D is the mm of mercury and x is in grams of the drug. Find the average rate of 2-(x-1/4)=x+2/3