PLZ HELP

3x+7y=12

6x-ky=6

for which of the following values for k will the system of equations above has no solution ?

-14

-7

0

7

14

Question

PLZ HELP

3x+7y=12
                              
                                6x-ky=6

for which of the following values for k will the system of equations above has no solution ?

-14

-7

0

7

14

nali · Answer

@jim_thompson5910 plz help

hawkfalcon · Answer

Did you try plugin them into a calculator?

nali · Answer

i dont get ur answer @hawkfalcon

nali · Answer

what do u mean by replace?

lopus · Answer

you can replace x in 9x+(7-k)y=18

nali · Answer

how did u know the value of x?

lopus · Answer

you plus two equations andsolve for x

nali · Answer

sorry i do not get u 

can u plz show ur work

nali · Answer

@lopus can u plz show step by step 

i get u so far but how ,in the end,did u find the value of ?

i need to learn how to do the problem

nali · Answer

@jim_thompson5910

jim_thompson5910 · Answer

Notice how 3x/6x = 1/2

So for the system to be inconsistent, then 

7y/(-ky) = 1/2

should be true as well

nali · Answer

ok so is it fourteen ? @jim_thompson5910

jim_thompson5910 · Answer

Negative 14. You lost a sign somewhere.

nali · Answer

oh yeah thanku so much :)

jim_thompson5910 · Answer

sure thign

jim_thompson5910 · Answer

thing*

jim_thompson5910 · Answer

no, it's -14

jim_thompson5910 · Answer

6x-ky=6

6x-(-14)y=6

6x+14y = 6

jim_thompson5910 · Answer

no it won't 

3x+7y=12
6x+14y = 6

has no solutions

lopus · Answer

ok im write wrong  3x-7y
sorry

jim_thompson5910 · Answer

np