exam Maths Puzzle Numerical Ability

Use any convenient method to solve the system.

4x - 16y =4
-3x + 12y =-3

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exam Other Question

Hi I am trying to figure out why I keep coming up with a (-2) for x. My book says the answer is a positive 2. Can someone please help me. Thanks.

p.s. I used the elimination method

3x=5y+11
2x=6y+2 Find the GCF after simplifying: 4i+8i^2(-23-8i)^2