exam Maths Puzzle Numerical Ability

solve the system by graphing
x+y=3
x+y= -1


My question is do I just pick a number to plug in for x & y or do I use the 3 and 1 somehow?

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exam Other Question
A company manufactures 3 products (A,B,C) each of which requires certain amount of 3 types raw materials(I,II,III) as well as three types of skilled labour(a,b,c).

For Product Hello,

I need help solving this word problem:


The length of a rectangle is 10 more than three times its width. The perimeter of the rectangle is 108. Find the dimensions of the rectangle.


Thank you