Mathematics
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OpenStudy (anonymous):
Help Plzz Help Me ASAP Its about Graphing
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OpenStudy (anonymous):
Picture Taken from Carnige
jimthompson5910 (jim_thompson5910):
y = mx+b
y = 2x + b ... Plug in m = 2
4 = 2(3) + b ... Plug in (3,4) or x = 3 and y = 4
Now solve for b
OpenStudy (anonymous):
can u explain how u did that
jimthompson5910 (jim_thompson5910):
Parallel lines have equal slopes
jimthompson5910 (jim_thompson5910):
The slope of y = 2x-1 is 2, so the slope of this parallel line is m = 2
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jimthompson5910 (jim_thompson5910):
The point (3,4) means that x = 3 and y = 4
jimthompson5910 (jim_thompson5910):
You plug all this info into y = mx+b and you solve for b to find the equation of the parallel line.
jimthompson5910 (jim_thompson5910):
Tell me what you get when you solve for b
OpenStudy (anonymous):
ok
OpenStudy (anonymous):
|dw:1346537844471:dw| is that the correct equation
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jimthompson5910 (jim_thompson5910):
yes, now multiply 2 and 3 to get 6 an go from
4 = 2*3 + b
to
4 = 6 + b
jimthompson5910 (jim_thompson5910):
to go from*
OpenStudy (anonymous):
4=6b
jimthompson5910 (jim_thompson5910):
no, you can't add 6 and b to get 6b
OpenStudy (anonymous):
ok
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OpenStudy (anonymous):
so what do i do now
jimthompson5910 (jim_thompson5910):
Subtract 6 from both sides
4 = 6 + b
4 - 6 = 6 + b - 6
-2 = b
b = -2
So the equation of the line CD is y = 2x - 2