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Mathematics 21 Online
OpenStudy (anonymous):

y=-x identify the slope and y-intercept!

jimthompson5910 (jim_thompson5910):

y=-x really looks like y = -1x + 0

jimthompson5910 (jim_thompson5910):

compare this to y = mx+b

OpenStudy (anonymous):

so the slope is -1?

jimthompson5910 (jim_thompson5910):

good

jimthompson5910 (jim_thompson5910):

what else

OpenStudy (anonymous):

x-y=6 and 2x+5y-=10

jimthompson5910 (jim_thompson5910):

no i mean what is the y intercept of y = -x

OpenStudy (anonymous):

its 0!

jimthompson5910 (jim_thompson5910):

good which is the point (0,0)

OpenStudy (anonymous):

so if its x-y=6 the slope is -1 and the y-inter is 6 right?

jimthompson5910 (jim_thompson5910):

close, but no

jimthompson5910 (jim_thompson5910):

x-y=6 -y=-x+6 y=x-6

OpenStudy (anonymous):

oh so it is 1 and -6 :D

jimthompson5910 (jim_thompson5910):

yep

OpenStudy (anonymous):

so if 2x+5y=-10 its 5y=-2x-10? or is it +10?

jimthompson5910 (jim_thompson5910):

no you have to completely isolate y

jimthompson5910 (jim_thompson5910):

you do that by dividing both sides by 5

jimthompson5910 (jim_thompson5910):

oh it's +10

jimthompson5910 (jim_thompson5910):

nvm, one sec

jimthompson5910 (jim_thompson5910):

2x+5y=-10 5y=-2x-10 y=-2x/5-10/5 y = -2/5x - 2

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