Question 54021
Since a variable is squared, you do not have linear equation.
Y-intercept:
y^2 = 4(0) + 9
y^2 = 9
y = +- 3
(0,-3) and (0,3)
{{{graph(300,300,-5,5,-5,5,sqrt(4x+9),-sqrt(4x+9))}}}