Solve these systems of equations 7x+2y= -3 and -14x-4y=6 . I got y=3/2,
x= -6/7 am I right ?

Question

Solve these systems of equations 7x+2y= -3 and -14x-4y=6 . I got y=3/2,
 x= -6/7 am I right ?

aravindg · Answer

hmm multiply first equation with 2

aravindg · Answer

14x+4y=-6

aravindg · Answer

14x+4y+6=0

anonymous · Answer

well yeah i did that multiplying it by -2 so that when i add it in the second question -14x and 14X cancel out (I'm using linear combinations here)

aravindg · Answer

-14x+4y-6=0

anonymous · Answer

*equation

aravindg · Answer

if thats the case both x and y cancels out!!

aravindg · Answer

isnt it?

anonymous · Answer

In the first equation you do 2y times -2 = -4y. Now in the 2nd equation you have -4y soo -4y+ -4y is -8y which means that the ys don't cancel out

aravindg · Answer

nt really :)

aravindg · Answer

infact both these lines are the same !!

aravindg · Answer

take a look at the graph

aravindg · Answer

anonymous · Answer

yes I see...so there's something I'm doing wrong in my math here !

anonymous · Answer

u were right they are the same line!

aravindg · Answer

take a look at the question you have posted !!

aravindg · Answer

:P yep makes sure u type the qns right :)