Question

The slope of a line is 1, and the y-intercept is -1. What is the equation of the line written in slope-intercept form?

y = x - 1
y = 1 - x
y = -x - 1

Answer 1

The slope-intercept form is:
y = mx + b
where m = slope, and b = y-intercept.
You need a slope of 1, so m = 1.
You need a y-intercept of -1, so b = -1.
Replace m with 1 and b with -1 in the slope intercept form to get

y = 1x + (-1)

which simplifies to

y = x - 1