exam Maths Puzzle Numerical Ability

x-y=-5
x=3y=3 couldyou please help me understand how to solve this problem?

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exam Other Question

Solving Systems of Equations in Three Variables.
2r+s+t=14
-r+-3s+2s=-2
4r-6s+3s=-5
How do i get to the two systems of the equation using elimanation and to find the first variable?
celsius temperature readings can be converted to fahrenheit reading using the formula F = 9/5C + 32. What is the fahrenheit temperature that corresponds to each of the following celsius temperatures: -10, 0, 15, 100?