exam Maths Puzzle Numerical Ability

Solve by the substitution method
9x+5y=-8
-5x+y=12

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exam Other Question

linear algebra

I do not understand how to solve problem with a number and one letters is rises two the second power. for example 3q and q is rises to the second power subtract 7 When x number of units are sold, the price of each unit (in
dollars) is given by P=-x/2+75. Find the unit price when the following quantities
are sold: 2, 7, 9, 11.