exam Maths Puzzle Numerical Ability

Solve the system by graphing.
x - y = 5
x + y = 3

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exam Other Question

Solve the system by graphing.

x - y = -3
x - y = 4

Thank you. need this solved in a proportion

Katherine drove 100 miles on 7 gallons of gasoline. How far can she drive on a full tank of 20 gallons?