book Maths Puzzle Numerical Ability

Use a system of equations to solve the following:

The sum of two numbers is 54. The difference of the two numbers is 18. Find the two numbers.

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A car radiator has a capacity of 16 quarts and is filled with a 25% antifreeze solution. How much must be drained off and replaced with pure antifreeze to obtain a 40% antifreeze s 3. y=-x-5 please solve these im not stupid the questions are just hard
x=-3
4. y=x-6
y=-4
5.y=-x-4
y=x+2
6. y=x-3
y=-x+5