find the value of k for which the pair of linear equation 2 X + 3 Y equal to 7 and 4 x + a y equal to 14
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consider equation (1)
2x + 3y = 7
multiple whole equation with 2
( 2x + 3y = 7 ) * 2
==> 4x + 6y = 14
now
4x + ay = 14 ............ (1)
4x + 6y = 14 ............(2)
substracting (2) with (1)
we get
ay - 6y = 0
==> ay = 6y
y on both sides get cancel
==> a = 6
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