# Find the value of k so equations x+2y= -7, 2x+ky+14= 0 will be coincident.

2
by samiaarshan

2015-06-25T16:25:51+05:30

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X + 2y = -7    (1)
2x + ky = -14  (2)
multiply equ (1) by 2 we get ,
2x + 4y = -14
2x + ky = -14  ( subtract the equations)
...................
4y - ky = 0
y ( 4 - k) = 0
y = 0; 4 - k = 0
y = 0 ; k = 4
apply y values in equ (1) we get
x + 2 (0) = -7
x = - 7
x = -7,  y =0 , k = 4
2015-06-25T16:28:13+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
X + 2y = -7
x + 2y + 7 = 0
2x + ky + 14 = 0

These two are coincident.

So, k is 4.