exam Maths Puzzle Numerical Ability

hi,
Solve this system using Cramer's rule x-3y=8 and 2x+2y=8. Can someone help me with this? thank you!

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exam Other Question

What is the GCF?

16a^4b^2 + 20a^2b^2 - 4ab^2 Hi! I need some help solving this equation and if possible expressing my answer as on ordered pair.

y=2x+1
x+y=4

Thanks in advance for your help!