exam Maths Puzzle Numerical Ability

Solve the system by graphing.
2x + y = 8
2x - y = 0

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exam Other Question

I am wondering what if an equation had three variables, how would you solve and graph it? Does it change the graph? When factoring 2x2 + 4x + 6, the first step is:

find the factors of 6
find the factors of 2
take out the GCF
find the factors of 2 times 6 which add to give 4