Q. 47

# Without using the

Answer :

Given: = Multiplying we get, From above we can see that,

5 x – 7 z = – 16 …(1)

–2x + 3 z = 7 ….(2)

5 y – 7 u = – 6 …..(3)

–2y + 3 u = 2 ……(4)

Now we have to solve these equations to find values of x, y, z and u

Multiplying eq (1) by 2 and eq (2) by 5 and adding the equations we get,

10 x – 14 z + 10 x + 15 z = –32 + 35

Z = 3

Putting this value in eq(1) we get,

5 x – 21 = – 16

5 x = 5

X = 1

Now, multiplying eq(3) by 2 and eq(4) by 5 and adding we get,

10 y – 14 u + 10 y + 15 u = –12 + 10

u = –2

Putting value of u in equation (3) we get,

5 y + 14 = = – 6

5 y = – 20

Y = –4

Therefore now we have, Rate this question :

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