Question

Como resolver las siguientes ecuaciones
6x+y=27
2x-y=5

3x+2y=18
4x-2y=10

X+2y=15
X-2y= -9

5b-c=33
7b+c=51

Answer 1

6x+y=27
2x-y=5

8x =32
x=4

luego
6x+y=27
6(4)+y=27
y=27-24=3



3x+2y=18
4x-2y=10

7x=28
x=4

3x+2y=18
3(4)+2y=18
2y=18-12
y=6/2 =3


X+2y=15
X-2y= -9

2x=6
x=3

X+2y=15
3+2y=15
y=12/2 =6


5b-c=33
7b+c=51

12b=84
b=7

5b-c=33
5(7)-c=33
-c=33-35
c=2