Answer
$y=-2x+4$
slope = -2
y-intercept = 4
Work Step by Step
RECALL:
The slope-intercept form of a line's equation is given as $y=mx+b$ where m = slope and b = y-intercept.
Subtract $2x$ on both sides of the equation to obtain:
$y=4-2x
\\y=-2x+4$
The line has a slope of $-2$ and a y-intercept of $4$.