exam Maths Puzzle Numerical Ability

Draw the graph of a line with y-intersept 5 and slope of 7/5.

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I need help I am not sure How to do this problem

Find the slope of any line perpendicular to the line through points (0, 5) and (-3, -4). (Rewrite into standard form)
Solve the folowing system.
x - y = 1
x + y = 1