What is the equation in slope-intercept form of a line that had a slope of -1/2 and a y-intercept of 6

Recall that slope-intercept form is y=mx+b where:

m --> slope
b --> y-intercept

Given a slope of m=-1/2 and a y-intercept of b=6, the equation in slope-intercept form would be y=-1/2x+6

slope=m and intercept=b

y = mx+b
so plug in your numbers