1.

2x + y - Bz1. Ifх2yfind the value of z when x = 1 and y = 4.y + 3xV-UC​

Answer»

3x−4y+7z=0.....(i)
2x−y−2z=0......(ii)
3x
3
−y
3
−z
3
=8....(iii)
Applying CROSS MULTIPLICATION on (i) and (ii)
8+7
x
​
=
−6−14
−y
​
=
−3+8
z
​

15
x
​
=
20
y
​
=
5
z
​

3
x
​
=
4
y
​
=z=K
⇒x=3K,y=4k,z=k
Substituting x,y and z in (iii)
⇒x=3k,y=4k,z=k
3(3k)
3
−(4k)
3
+(k)
3
=8
k
3
=1
k=1
⇒x=3,y=4,z=1


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