Question

5x+5y=41
2x-y=3


5x-y=1
2x-3y=10

resolva estas duas equações

Answer 1

a) 5x+5y=41
2x-y=3 (×5)

5x + 5y= 41
10x -5y= 15

15x= 41 + 15
15x= 56
x= 56/15
x= 3,73

5x+5y=41
5(3,73) + 5y= 41
18,65 + 5y= 41
5y= 41 - 18,65
5y= 22,35
y= 22,35/5
y= 4,47


b) 5x-y=1 (×-3)
2x-3y=10

-15x +3y= -3
2x - 3y= 10

-13x= -7 (×-1)
x= 7/13
x= 0,53

2x-3y=10
2(0,53) -3y= 10
1,06 -3y= 10
-3y= 10 - 1,06
-3y= 8,94 (×-1)
y= -8,94/3
y= -2,98