exam Maths Puzzle Numerical Ability

y=2x+1
y=3x+1

What do you do in these. Do you graph or solve it? or both

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exam Other Question

Can someone help me solve this quadtratic problem:

2x2+7x+5

4+7x+5
9+7x what is the radius of a circle when the center is at (2,2) and the area is 4pi