3: Suppose a line has slope-2/3 and passes through the point (1, 8). Which other point must also be on the graph?
A) (7,4)
B) (7,12)
C) (-5,4)
D) (-5, -12)
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OpenStudy (katey3324):
b
sam (.sam.):
Nope
OpenStudy (katey3324):
c
sam (.sam.):
Wrong again
OpenStudy (katey3324):
d
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sam (.sam.):
Have you did the equation first?
OpenStudy (katey3324):
i'm not good at math
OpenStudy (katey3324):
@logan13
sam (.sam.):
You should find the equation first then you could apply these coordinates A,B,C or D to find whether they fit in,
you have a slope of, m=-2/3 and coordinate (1,8) to be \((x_1,y_1)\), using the standard \(y-y_1=m(x-x_1)\), your equation will be
\(y=-\frac{2}{3}x+\frac{26}{3}\)
Then, use the answers to see if they're correct by substituting in
OpenStudy (katey3324):
i'm not good at this
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sam (.sam.):
Try using B
(7,12),
When x is 7,
\[y=-\frac{2}{3}(7)+\frac{26}{3} \\ \\ y=-\frac{14}{3}+\frac{26}{3} \\ \\ y=12\]
This means B, that point, is also on the equation of that graph