Question

if x + y = 9 and y - x = 8
and x + y + z = 10

and find the value of x, y, and z also show which variable has greatest value​

Answer 1

x+y+z=10

x+y=9
Means

9+z=10
z=10-9
z=1

Now.
X+Y=9
Y=9-x

Y-X=8
9-x-x=8
9-2x=8
-2x=8-9
$\cancel{-}2x=\cancel{-}1.$
x=1/2

Then We know
x+y=9
1/2+y=9
y=9-1/2
y=18-1/2
y=17/2

We got
$\boxed{\mathbf{x=\frac{1}{2}}}$

$\boxed{\mathbf{y=\frac{17}{2}}}$

$\boxed{\mathbf{z=1}}$