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Serhud [2]
3 years ago
5

PLZ HELP! VERY URGENT! A line passes through (6,3), (8,4), and (n,-2). Find the value of n.

Mathematics
2 answers:
rusak2 [61]3 years ago
8 0
To find the value of n we have 2 substitute (n, -2) to equation 
-2 =1/2 n      |.2 
n = -4 
Phantasy [73]3 years ago
5 0

We have a line passing through 3 points. We can use the first
two points to find the equation of the line.
(6,3), (8,4)

slope m = (4-3)/(8-6) = 1/2

We can use the point slope form y-y1 = m(x-x1) or
the slope intercept form y = mx + b
to find the equation of the line.

Let's take the point (6,3) and use y = mx + b to find b
y = 3, x = 6, m = 1/2

3 = (1/2)(6) + b
3 = 3 + b
0 = b

The equation of our line is y = (1/2)x

We have a line of equation y = (1/2)x going through point (n,-2)

Plugging in we have: -2 = (1/2)n
2(-2) = n
-4 = n

Your answer is n = -4

NOTE: looking at the 3 points as given initially: (6,3), (8,4), (n,-2)
We can see that 3 = (1/2)6 and 4 = (1/2)8 so -2 = (1/2)n makes sense

Hope this helps you :)
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