Question

x-y+z=170 , x-z+y =130 x= ?

Answer 1

Answer :

The given equations are

    x - y + z = 170 ...(i)

    x - z + y = 130 ...(ii)

We need to find the value of x

Taking the sum of (i) and (ii) no. equations, we get

    x - y + z + x - z + y = 170 + 130

==> 2x = 300

==> x = 300/2

==> x = 150

Therefore, the required solution be

    x = 150

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Answer 2

x-y=170-z
x=170-z+y...... (1)
x+y=130+z
170-z+y=130 (from 1)
170-130=z-y
40=z-y......(2)
given x-y+z=170
x+z-y =170
x+40=170 (from 2)
x=130