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Mathematics 17 Online
OpenStudy (anonymous):

i need help please..

OpenStudy (anonymous):

the solution of _____ includes the entire ine of y=2x+1

hartnn (hartnn):

and.... ? list the choices also.

OpenStudy (anonymous):

A)y>2x+2 B)y<2x+1 C)y>2x D)y>2

hartnn (hartnn):

can u plot lines? like if i tell you to plot, y=2x+2, can u do it ?

OpenStudy (anonymous):

no.

hartnn (hartnn):

awww.... you want to learn ??

OpenStudy (anonymous):

ok

hartnn (hartnn):

so, we'll plot lines by finding the 'intercepts' Lets find 'x' intercept. its found by putting y=0 in the line equation so, put y=0 in y=2x+2 and tell me what u get ?

OpenStudy (anonymous):

0=2x+2

hartnn (hartnn):

x=.. ?

OpenStudy (anonymous):

idk

OpenStudy (anonymous):

0

hartnn (hartnn):

no, 0=2x+2 subtract 2 from both sides, what u get ?

OpenStudy (anonymous):

0

hartnn (hartnn):

huh? how ?

OpenStudy (anonymous):

0=2x+2 then i - 2 from the 2's in the equation

hartnn (hartnn):

its not done like that 0=2x+2 subtracting 2 from both sides will give you 0-2 =2x+2-2 got this ?

OpenStudy (anonymous):

kind

OpenStudy (anonymous):

*kinda

hartnn (hartnn):

ask if there are any kinds of doubts on how this, how that... so, 0-2 =2x+2-2 -2 = 2x Dividing 2 from both sides. -2/2 = 2x/2 x= -1 so the 'x' intercept is (-1,0)

OpenStudy (anonymous):

what?

hartnn (hartnn):

which step did u not get ?

OpenStudy (anonymous):

oo.. nvm now i get it

hartnn (hartnn):

good, now similarly find 'y' intercept for me. putting x=0 in the line equation so, put x=0 in y=2x+2 and tell me what u get ?

OpenStudy (anonymous):

y=2(0)+2

hartnn (hartnn):

so, y=... ?

OpenStudy (anonymous):

idk..

hartnn (hartnn):

what is 2*0 =.. ?

OpenStudy (anonymous):

0

hartnn (hartnn):

so, y=.. ?

OpenStudy (anonymous):

0

hartnn (hartnn):

no, y=0+2 =2 ok ?

OpenStudy (anonymous):

ok..ooo i forgot the +2

hartnn (hartnn):

so, y intercept is (0,2) ok ? now can u plot points on the graph(co-ordinate axes ?)

OpenStudy (anonymous):

ok..

hartnn (hartnn):

can u plot points on the graph(co-ordinate axes ) ?

OpenStudy (anonymous):

ya

hartnn (hartnn):

then plot both the intercepts, (-1,0) ans (0,2) for me.

OpenStudy (anonymous):

ok did

hartnn (hartnn):

now join those points with a straight line. and ta-da you got your line y=2x+1 !!

hartnn (hartnn):

*y=2x+2

OpenStudy (anonymous):

but i put that in my quiz and it said that i got it wrong

hartnn (hartnn):

we just learnt to plot a line!! y>2x+2 will give you the region..... you know how to find that region ?

OpenStudy (anonymous):

ya but on my quiz i tryed both a and band they were doth wrong

OpenStudy (anonymous):

*b and

hartnn (hartnn):

why u trying randomly ? lets solve it completely and be sure about an answer ... ok ?

OpenStudy (anonymous):

ok

hartnn (hartnn):

so, i'll draw the line y=2x+2 , you tell me which region ? upper or lower? |dw:1356997037352:dw|

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