Question

stiind ca x+y=-7 si y+Z=1 calculati

a)3x + 3y - 1
b)x+2y+z
c)2x+5y+3z-7 

Please!!!

Answer 1

Răspuns:

Explicație pas cu pas:

a)

$3x+3y-1=3(x+y)-1=3 \cdot (-7)-1=-21-1= \bf-22$

b)

$x+2y+z=(x+y)+(y+z)=-7+1= \bf-6$

c)

$2x+5y+3z-7=2x+2y+3y+3z-7=2(x+y)+3(y+z)-7=-14+3-7=3-21= \bf -18$