exam Maths Puzzle Numerical Ability

Solve each of the following systems by graphing.

5.
x � y = 8
x + y = 2

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exam Other Question

My car gets 12 miles per gallon of gasolene. Gas is 4$/gallon.
If I buy a car that gets 16 miles per gallon at a cost of $500, how long or how many miles will it take me to pay for it with savings of gas cost?

Help please,
Bob Table of values. Please help me to determine the table of values for:

y=-x^2+6x-2

Thanks