SOLUTION: Which of the following equations represents a line I that goes through (-1,-3) and has a slope of 4? A) y=4x-3 B) y=4x+1 C) y=4x-1 D) y=4x+3

Question 199753: Which of the following equations represents a line I that goes through (-1,-3) and has a slope of 4?
A) y=4x-3
B) y=4x+1
C) y=4x-1
D) y=4x+3
Answer by tutor_paul(519) (Show Source): You can put this solution on YOUR website!
All of the possible solutions are written in format, where:
m = slope
b = Y-intercept
.
You are given the information that the slope is 4 and that the line goes through a point. If you graph the point (-1,-3), you can figure out the Y-intercept. Simply count 4 units "up" on the graph (positive direction) and 1 unit to the "left" on the graph (also positive direction). Why? because the slope is the change in y divided by the change in x. So on the graph, you are now sitting at point (0,1). Thus 1 is the Y-intercept.
.
So the correct equation of the line is:

.
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Good Luck,
tutor_paul@yahoo.com
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