Chapter 5 - Solving Systems of Linear Equations - 5.7 - Systems of Linear Inequalities - Exercises - Page 280: 55

$y=\frac{4}{3}x$

The equation of line in slope-intercept form is $y=mx+b$ where $m$ is the slope and $b$ is the y-intercept. Given: $m=\frac{4}{3}$ and $b=0$ Substituting the values, we get $y=\frac{4}{3}x+0$ or simply $y=\frac{4}{3}x$