SOLUTION: Okay could I please get help with this one. I've to a certain point and have gotten stuck. I need to find the equation of a line that passes through points (0,2) and (4,4) Th

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Okay could I please get help with this one. I've to a certain point and have gotten stuck. I need to find the equation of a line that passes through points (0,2) and (4,4) Th      Log On


   



Question 133406: Okay could I please get help with this one. I've to a certain point and have gotten stuck. I need to find the equation of a line that passes through points
(0,2) and (4,4)
This is what I have done so far.
first to find the slope I used m = 4 -2/4-0
The intercept would be 2/4
now for the point slope of the line I used y-2 = 2/4 (x + 0)
y -2 = 2/4x + 2/4
y-2 + 2 = 2/4x + 2/4 + 2
y = 2/4x + this is where I have gotten lost
I would appreciate the help

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
First lets find the slope through the points (0,2) and (4,4)

m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29 Start with the slope formula (note: is the first point (0,2) and is the second point (4,4))

m=%284-2%29%2F%284-0%29 Plug in y%5B2%5D=4,y%5B1%5D=2,x%5B2%5D=4,x%5B1%5D=0 (these are the coordinates of given points)

m=+2%2F4 Subtract the terms in the numerator 4-2 to get 2. Subtract the terms in the denominator 4-0 to get 4


m=1%2F2 Reduce

So the slope is
m=1%2F2

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Now let's use the point-slope formula to find the equation of the line:



------Point-Slope Formula------
y-y%5B1%5D=m%28x-x%5B1%5D%29 where m is the slope, and is one of the given points

So lets use the Point-Slope Formula to find the equation of the line

y-2=%281%2F2%29%28x-0%29 Plug in m=1%2F2, x%5B1%5D=0, and y%5B1%5D=2 (these values are given)


y-2=%281%2F2%29x%2B%281%2F2%29%280%29 Distribute 1%2F2

y-2=%281%2F2%29x%2B0 Multiply 1%2F2 and 0 to get 0%2F2. Now reduce 0%2F2 to get 0

y=%281%2F2%29x%2B0%2B2 Add 2 to both sides to isolate y

y=%281%2F2%29x%2B2 Combine like terms 0 and 2 to get 2
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Answer:


So the equation of the line which goes through the points (0,2) and (4,4) is:y=%281%2F2%29x%2B2

The equation is now in y=mx%2Bb form (which is slope-intercept form) where the slope is m=1%2F2 and the y-intercept is b=2

Notice if we graph the equation y=%281%2F2%29x%2B2 and plot the points (0,2) and (4,4), we get this: (note: if you need help with graphing, check out this solver)

Graph of y=%281%2F2%29x%2B2 through the points (0,2) and (4,4)

Notice how the two points lie on the line. This graphically verifies our answer.