exam Maths Puzzle Numerical Ability

could I please have help with this question?
Solve the following system of equations by graphing:
y=5x-7
y-5x=8
thank you

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exam Other Question

a motorboat covers a certain downstream in a river in 5 hours. it cover the same distance upstream in 5 hours and a half. the speed of water is 1.5 km. find the speed of the boat in still water. what are the 7 properties?