exam Maths Puzzle Numerical Ability

Graph the system of inequalities

x<=2
y>=-2x+3

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exam Other Question

In a box, there are 25 coins consisting of quarters, dimes and nickels with a total amount of $2.75. If the nickels were dimes, the dimes were quarters and the quarters were nickels, the total amount would be $3.75. How many quarters are there? Solve using a Matrix Equation(matrix inverse)
2x-3y=13
x+y=-1

Please help, this stuff is new to me!!