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Find y-intercept given slope and point
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Find slope given 2 points
Write equation given 2 points
Find y-intercept given slope and point
Find x-intercept given 2 points
Find x-intercept given y-intercept and slope
The slope of a line is
8
9
, and the line passes through the point (
45
,
184
). What is the y-intercept of the line?
Answer
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Hint
Can you answer 10 correctly?
Given a point (45, 184) and slope of
8
9
, the y-intercept is
?
The equation of a straight line in slope-intercept form is y = mx + b
b
is the y-intercept, which is where the line cross the y-axis (meaning x=0)
m
is the slope of the line, which tells you how steep the line is
For example, if you are given points (3,7) and slope of m=4
Set the equation of the line to y = 4x + b
Plug in the point into the equation to find the y-intercept, so 7 = 4 x 3 + b, 7 = 12 + b, b = -5