Which is the equation of a line with a slope of - 13 and a y-intercept at (0, 1) ?

Use the slope-intercept form of the equation of a line.

y = mx + b

where m = slope, and the y-intercept is (0, b).

You have a slope of - 13, so m = - 13. Your y-intercept is (0, 1), so b = 1.

y = - 13x + 1

y=-13x+1 because the plus 1 is the y intercept shown as (0,1) and the x is the slope of - 13