Constant of proportionality from graphs

Google Classroom

Problem

The graph below shows a proportional relationship between $x$x and $y$y.

What is the constant of proportionality, $\dfrac{y}{x}$start fraction, y, divided by, x, end fraction ?

$\small{1}$$\small{2}$$\small{3}$$\small{4}$$\small{5}$$\small{6}$$\small{7}$$\small{8}$$\small{2}$$\small{4}$$\small{6}$$\small{8}$$\small{10}$$\small{12}$$\small{14}$$\small{16}$$\small{18}$$\small{20}$$\small{22}$$\small{24}$$\small{26}$$\small{28}$$\small{30}$$y$$x$

Hint #11 / 3

We can find the constant of proportionality by finding the value of $y$y when $x=1$x, equals, 1.

Hint #22 / 3

$y=4$y, equals, 4 when $x=1$x, equals, 1

Hint #33 / 3

The constant of proportionality, $\dfrac{y}{x}$start fraction, y, divided by, x, end fraction, is $\dfrac{4}{1}$start fraction, 4, divided by, 1, end fraction or just $4$4.