book Maths Puzzle Numerical Ability

write an equation in slope intercept form of the line with each slope and y-intercept.

m=0,b=4

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book Other Question

I need help solving this quadratic equation:
(x-2)^2+x^2=10
I need to simplify in simplest radical form. I really don't understand how to do this with fractions.

square root of 3/5