exam Maths Puzzle Numerical Ability

Please help me with this. I am no good at this stuff.
Find the slope of the line through the following pairs of points.
(-5, -3) and (-5, 2)

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Would someone check this for me and see if it is correct? I do apreciate it and thank you so much.

Add -3/5 + (8/35)

My answer is -13/35 translate into a algebraic equations :

1) A girl buys three apples and seven oranges for $4.56. If an orange costs $0.28 more than an apple, how much does each fruit cost?