exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Solve the Inequalities.

1. 4x-3≤17

2. 2y-9>5y+12

3. -8<3x+4<22

4. 3x-5<-11 or 2x-3>3 hi,
two linear equations:
x=-3y
x+y=4
Which points represent the common solution for the two equations?

the answer is (6, -2) how did they get that?

thanks