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Write equation given 2 points
All Graph math games
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
A line passes through the points (
-39
,
-345
) and (
65
,
-465
). What is the equation of the line?
y
=
-15
13
x
- 338
y
=
-13
15
x
- 338
y
=
-15
13
x
- 389
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Hint
Can you answer 10 correctly?
Given points (-39, -345) and (65, -465), the equation 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 two points: (1,3) and (4,−3)
Find the slope using the equation of (y2 - y1) / (x2 - x1), so (-3 - 3) / (4 - 1), -6/3 = -2
Set the equation of the line to y = -2x + b
Plug in one of the points into the equation to find the y-intercept, so 3 = -2 x 1 + b, 3 = -2 + b, b = 5
Add it to the equation, so y = -2x + 5
