Chapter 3 - Graphing Linear Functions - 3.5 - Graphing Linear Equations in Slope-Intercept Form - Exercises - Page 142: 19

Slope $m=2$ and y-intercept $b=4$.

The slope-intercept form is $y=mx+b$ where $m$ is the slope and $b$ is the y-intercept. Given that $-2x+y=4$ which can be written as $y=2x+4$. Comparing with the slope-intercept form, we get $m=2$ and $b=4$.