Astudent claims that the equation y=7 is not a linear equation because it does not have the from y=m x+b. do you agree or disagree? why?

That is false.
 y=7 is just a simplified way of writing y = 0 x 1 + 7

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.