What is the y-intercept of a line that has a slope of 3 and passes through point (–1, –7)?

Use the slope-intercept form y = mx + b, where m = 3 and b is the y-intercept. Substitute the point (−1, −7): −7 = 3(−1) + b, so −7 = −3 + b and b = −4. The y-intercept is −4, choice B.

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