Question

Sa se rezolve in RxR sistemul de ecuatii
{x-3y=-5
{2x+3(y-5)=-7

Answer 1

x-3=  -5
2x+3×(y-5)= -7


x=  -5+3
2x+3y-15=-7

x= -2
2x+3y= -7+15

x=- 2
2x+3y= 8


2×(-2)+3y=8
-4+3y= 8
3y=8+4
3y=12 |÷3
y=4

2.
2x+y=5 3y+2(x-3)=1

2x+y=5
2x+3y=1+6

2x+3y=7  -
2x+y=5
----------------
/    2y= 2
       y=1

2x+1=5
2x=5-1
2x=4
x=2