Ineed with question number 1.
i know how to solve it but how do you write out the equation? ?

Sum means add.
difference means subtract.

x + y = 36
x - y = 24  Just to make it complete, I finish the problem. Add the two equations.

2x = 60 Divide by 2
x = 60/2
x = 30

x + y = 36 Substitute for x
30 + y = 36 Subtract 30
y = 36 - 30
y = 6

So the solution point is (30,6)