exam Maths Puzzle Numerical Ability

I have not been able to figure out how to do the following problem.
x + 3y =2
x - 2y =-3

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exam Other Question

Graph the line using three points
y=1/2x-1 Please help me to solve following
(n-1)
E [(n-m+1)(n-m) + (n-m)]
(m=1)
I am using E for sigma sign.

B. Chakraborty