Răspuns
Explicație pas cu pas:
a. a+b=5
a=5-b
5(5-b)+4b=22
25-5b+4b=22
25-22=5b-4b
b=3
a+3=5
a=5-3 a=2
b. 8a+5b=33
a+b=6
a=6-b
8(6-b)+5b=33
48-8b+5b=33
48-33=8b-5b
15=3b
b=15/3 b=5
a+5=6
a=6-5=1 a=1
c. 7a+8b=22
a+2b=4
a=4-2b
7(4-2b)+8b=22
28-14b+8b=22
28-22=14b-8b
6b=6
b=6/6=1 b=1
a+2=4
a=4-2 a=2