book 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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book Other Question

Al is 4 years younger than Ed.
Let x = Ed's age.

Then___________ = Al's age.

Question 2
The Lions played 76 ball games.
They won 3 times as many games as they lost.
How m
How do you do y= 2x + 3 using substitution?
y= 3x + 1