Question

dacă a-3b=9,alflati x din relatiile:
a)x+3a-9b=31
b)2x+2a-6b=36
c)32-x+7a-21b=42
d)11-2x+5a-15b=2a-6b

Repede....pls dau

Answer 1

a) X+3(a-3b)=31

X+3x9=31

X=31-27

X=4

b)2X+2(a-3b)=36

2x+18=36

2x=18

x=9

c)32-x+7(a-3b)=42

32-x+63=42

95-x=42

x=-53

d)11-2x+45=18

56-2x=18

2x=38

x=19