exam Maths Puzzle Numerical Ability

I have two questions I am so lost,

1. Find the slope for y-2x=2

2. find the slope for the line passing through (3,-1) and 1,3)

Thank you so much for any help.

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exam Other Question

(-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done? I need help solving these two seperate problems by using the substitution method. Can anybody help?
1. 1.25x+1.10y=1520

2. 1.10x+1.25y=1535

Please somebody help me!