Question

if 2x + 3y =31,y - z =4 and x + 2y = 11 then find the value of x+y+z.

Answer 1

the ans is 8 and x=29 y=-9 abd z= -13

Answer 2

2x + 3y = 31 . . . .(i);

y - z = 4 . . . (ii)

and x + 2z = 11 . . . .(iii)

Multiplying (iii) by 2 and subtracting from (i),

we get : 3y - 4z = 9 . . . .(iv)

Solving (ii) and (iv),

we get : y =7, z = 3.

Putting y = 7 in (i), we get :x = 5.

∴

 x + y + z = (5 + 7 + 3) = 15.