exam Maths Puzzle Numerical Ability

I am having a very hard time remembering how to solve this type of system

1/40 + 1/(x+10) = 1/y

1/60 + 1/x = 1/y

Thank you,

Kristin

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exam Other Question

which of the following is a step in the solution of the given equations?
x^2+y^2=65
(1/2)xy=14
a. x+y=121
b.x^2-11x+28=0
c.x^2+2xy+y^2=79
d.11+-(121+112)^(1/2)
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2 Let A = (0,0), B = (4,2), C = (1,3), find the exact size of angle CAB. Justify your answer without your protractor.