book Maths Puzzle Numerical Ability

Solve the system of equations by the addition method.

x-4y=-18
-6-4y=64

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book Other Question

What is the least common multiple of p and s if the greatest common factor of p and s is 9? what is the function for all these number
-6,-5
-4,-4
-2,-3
0,-2
2,-1
4,0
6,1
8,2
they all have to have the same function