The given expression is
[tex]7.2y+4.5x=72[/tex]To find the y-intercept, we have to solve the equation for y.
[tex]\begin{gathered} 7.2y=72-4.5x \\ y=\frac{72-4.5x}{7.2} \\ y=10-0.625x \end{gathered}[/tex]Remember that the y-intercept is the independent term.
