Question

x+y=15
y+z=7,4
x+2y+z=?
urgent va rog​

Answer 1

Explicație pas cu pas:

x=y-15

y=7,4-z

z=7,4-y

x+2y+z=y-15+2×(7,4-z) +7,4-y=

=-7,6+14.8-2z=7,2-2z