Graham S. answered 05/26/16
Tutor
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Algebra to Advanced Calculus: Graduated USF Student
On any line the y-intercept is the result you get when x = 0. So for this line, just plug in 0 for x and see what you get. y = -6*0 - 1 = 0 - 1 = -1. Thus, the y-intercept is -1.
The y intercept is the point on a line that passes through y-axis. On the y axis, x always equals 0. So that's why we plug in 0 to look for the solution.