Sketch the graphs of the following functions by the method of plotting points:

(a) y = 3x².

(b) y = √1 - x²

(c) y = -√1 - x²

(d) y = 1/1-3

(e) f(x) = x³.

(f) y = 1/x².

(g) y = (x² - 9)/(x - 3)

(h) y = (x² - 1)/(x - 1)

(i) f(x) = x² −7x.

(j) y = − x².

(k) y = − x² + 7x.

(l) y = − x² −7x.

(m) f(x) = √x²