exam Maths Puzzle Numerical Ability

how do you solve x-8y=37 3x+8y=-17 by using the elimanation method it doesnt really help with the steps can you or anybody show me.

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exam Other Question

A postman delivered a total of 23 letters to 11 houses. If each house got atleast one letter, what is the largest number of letters that any one of the houses could have received? ABCD is a trapeziod with line segment BC perpindicular to line segment AB and line segment BC perpindicular to line segment CD, AB=13, BC=12, and CD=8. A line segment is drawn from