SOLUTION: Find the equation, in slope-intercept form, of the line that passes through the points (5, 2) and (-7, 3). Write the equation in slope-intercept form.

Algebra ->  Expressions -> SOLUTION: Find the equation, in slope-intercept form, of the line that passes through the points (5, 2) and (-7, 3). Write the equation in slope-intercept form.      Log On


   



Question 165172: Find the equation, in slope-intercept form, of the line that passes through the points (5, 2) and (-7, 3). Write the equation in slope-intercept form.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
One way to do it (not the only way) is this:
Write the general slope-intercept equation
y+=+mx+%2B+b where m is the slope
and b is the y-intercept
The line in the problem passes through
(5,2) and (-7,3)
Substitute the 1st point in the general equation
(1) 2+=+5m+%2B+b
Substitute the 2nd point in the general equation
(2) 3+=+-7m+%2B+b
You have 2 unknowns and 2 equations, so it's solvable
Subtract (1) from (2)
1+=+-12m
m+=+-%281%2F12%29
Substitute this in (1)
2+=+-%285%2F12%29+%2B+b
b+=+24%2F12+%2B+5%2F12
b+=+29%2F12
Now plug m and b back into the general equation
y+=+-%281%2F12%29x+%2B+29%2F12 answer
Check to see if the line passes through (5,2) and (-7,3)
2+=+-%281%2F12%29%2A5+%2B+29%2F12
24+=+-5+%2B+29
24+=+24
and
3+=+-%281%2F12%29%2A%28-7%29+%2B+29%2F12
36+=+7+%2B+29
36+=+36
OK