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Mathematics 36 Online
OpenStudy (anonymous):

Which ordered pair is not in the solution set of x-2y<6? a) (2,-2) b) (0,0) c)(5,1) d)(1,-6) thank you

OpenStudy (anonymous):

an explanation would be lovely too. thanks :)

OpenStudy (anonymous):

ok.we got both x and y coordinates with us.so simply start putting it in equation. a) 2-2(-2)<6 2+4 <6 6<6 No,that is not correct.What do you think?

OpenStudy (anonymous):

Okay, so next would be 0,0 so 0+0(-2)<6 so that would be -2<6 thats right yes?

OpenStudy (anonymous):

yes thats correct.what about the next one?

OpenStudy (anonymous):

next is 5,1 so 5+1(-2)<6 6+-2<6 -4<6 that would be correct

OpenStudy (anonymous):

Great.You got it.Lets proceed to the last one..

OpenStudy (anonymous):

1,-6 1+-6<6 -5<6 that would also be correct

OpenStudy (anonymous):

nvm i forgot to add the -2!

OpenStudy (anonymous):

one second

OpenStudy (anonymous):

But in (c),you did a small mistake that is 6+-2=4 not -4..But fortunately it will not change the conclusion.

OpenStudy (anonymous):

1,-6 1+-6(-2)<6 13<6 that wouldn't be correct

OpenStudy (anonymous):

Sorry for distracting..

OpenStudy (anonymous):

no thank you for telling me

OpenStudy (anonymous):

Yes,so we got two answers (a) and (d).Not possible..!Is it only less than or is it less than and equal to sign in the equation??

OpenStudy (anonymous):

its less than or equal too in the equation. so would that make it choice a?

OpenStudy (anonymous):

So it makes choice (a) correct....But the questions wants us to point out which one is not correct.So, Congratz,(d) is the only answer left.

OpenStudy (anonymous):

Thank you so much for your help and explaning this to me!

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