X^2 + y^2 = 4 determine whether or not the equation represents y as a function of x...please help me

The equation y=mx+b is the slope-intercept form of the equation of a line. what is the equation solved for b? y-m=b y-mx=b y/mx=b y/m-x=b

Question 5 spring semester final exam math evaluate

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1