exam Maths Puzzle Numerical Ability

please help me I am having trouble with this problem thank you in advance
solve the system by addition and substitution
3x -4x = 8
6x - 2y = 10

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exam Other Question
For any positive number a,b,m,n satisfying the condition

m/n = a /(a+b) the difference a/b - m/n is equal to

a) nb / ma
b) mb / na
c) ma / nb
d) ab / mn I got to find the slop of the line through the following pairs of points



(-5 , -3 ) and (-5, 2)