exam Maths Puzzle Numerical Ability

1) y+2=5/3 (x+6)

2) y+3=-5 (x+1)

3) y-1=5/6 (x-4)

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exam Other Question

Solve for n

7n+2[3(1-n)-2(1+n)]=14

I ggot the answer as 10, but when my mom checks it she cannot make it work. Decide whether or not each equation has a circle as its graph. If it does give
the center and the radius.

x^2+8x+y^2-6y+16=0