A student is shown nine sketches of graphs, labeled A to I.
A
B
C
D
E
F
G
H
I
Match each equation below to the letter of the graph that could represent it.
y=4x−1y = 4x - 1y=4x−1
y=3x2+2xy = 3x^2 + 2xy=3x2+2x
y=1x\displaystyle y = \frac{1}{x}y=x1