Question

ajutatima sa rezolv sistemul de ecuatii, dau 20 puncte
2a+2b=10
3a-3b=12

Answer 1

2a+2b =10/:2
a+b=5
3a-3b =12/:3
a-b=4
a=4+b
4+b+b=5/-5
2b=o

Answer 2

2a+2b=10
2a=10-2b
2a/2=10/2-2b/2
a=5-b
a=5-b,b apartine R

3a-3b=12
3a-3b+3b=12+3b
3a=12+3b
3a/3=12/3+3b/3
a=4+b
a=4+b,b apartine R