Question

Se da x*y+y*z=147 unde y=7
Afla x+z

Answer 1

xy+yz=147

y=7

x+z=?

7x+7z=147

7(x+z)=147

x+z=147:7

x+z=21

x+z=21

Answer 2

$x*y+y*z=147$

$y*(x+z)=147$

$7*(x+z)=147$

$x+z=147:7$

$x+z=21$