exam Maths Puzzle Numerical Ability

I have no clue how to do this problem can someone please help?

Solve the equations by graphing: y=5x-7
y-5x=8

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exam Other Question

A crew can row 8km downstreat and back in 4.8 hours. If the rate of the current is 4 kph, find the rate of the crew in still water.

Oh please help me!!
Matt Determine whether the following equations have a solution or not? Justify your answer.
p2 - 4p + 4 = 0