As per the standard equation of a straight line, the y-intercept of the given line is (- 21).
"The equation of a straight line can be written in different forms such as point-slope form, slope-intercept form, general form, standard form, etc."
The standard equation of the straight line is y = mx + c.
Here, 'm' is the slope of the standard straight line and 'c' is the y-intercept of the straight line.
(x, y) is the coordinate of any point on the straight line.
The given line is: y = 5x - 21
If we compare this given equation with the standard equation of a straight line y = mx + c, then we get: [tex]c = - 21[/tex].
Therefore, the y-intercept of the given line is (- 21).
Learn more about the y-intercept of a straight line here: https://brainly.com/question/14180189
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