exam Maths Puzzle Numerical Ability

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!

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exam Other Question

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. Hello out there,I really need some help with some problems,The first one is,State whether the system is consistent and independent,consistent and dependent,or inconsistent,4x+2y=8