exam Maths Puzzle Numerical Ability

solve by graphing
2x-y=5
3x+y=5

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exam Other Question

The equation V = -2000t + 21,000 describes the value in dollars of a certain model of car after it is t years old. If a car is worth $11,000, substitute 11,000 into the equation to find the age of the car.

Please explain step-by-step. ((2x)^3(xy)^2) + (2xy)^2(-x)^3 = (8x^3)(x^2y^2)+(4x^2y^2)(-x^3)
= 8x^5y^2-4x^5y^2
= 4x^5y^2
((2x)^3(xy)^2)((2xy)^2(-x)^3 = -32x^10y^4