f(x) = 2x + 3
f is a linear function, with a slope of 2 and a y intercept of 3
first step would be to draw a point at (0,3)
next go up 2 right 1 to (1,5) and draw a point
and just go like that
it should look like that
the zero is -1.5
algebraically
y = 2x + 3
0 = 2x + 3
-3 = 2x
-1.5 = x