Writing the Equation of a Line | MathHelp.com - Free Educational videos for Students in K-12 | Lumos Learning

## Writing the Equation of a Line | MathHelp.com - Free Educational videos for Students in k-12

#### Writing the Equation of a Line | MathHelp.com - By MathHelp.com

Transcript
00:0-1 A line with a slope of 3/4 passes through the
00:04 .128 right ? It's equation in slope intercept form .
00:11 Remember that slope intercept form is the same thing as
00:16 Y equals mx plus B form . And to write
00:25 the equation of a line in Y equals mx plus
00:29 B form . We need to know the values of
00:32 M and B to find the value of em .
00:37 Remember that M represent slope And were given that the
00:41 slope of the line is 3/4 . So we know
00:45 that the value of M is 3/4 , Which means
00:51 that we can substitute a 3/4 into our formula for
00:55 em . Next to find the value of B .
01:02 were given that the line passes through the .128 ,
01:08 Which means that we can use 12 and eight as
01:11 our values for X&Y . So we substitute a 12
01:22 in for X And an eight in for why .
01:27 And we have eight equals 3/4 times 12 plus B
01:36 , solving for B , three forth tons , 12
01:40 is nine , so we have A Equals nine Plus
01:46 B And subtracting nine from both sides . Yeah ,
01:53 negative one equals B , so M equals 3/4 and
02:04 B equals negative one . And we substitute these values
02:09 into our formula for M and B . To get
02:14 y equals 3/4 x -1 . So the equation of
02:27 a line with a slope of 3/4 and passes through
02:31 the .128 Is why equals 3/4 x -1 .
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