Question

Resolver por sustitucion:
12x-5y=15
3x+y=1
........................
4a-10b=0
a+5b=1

Plz.....

Answer 1

12x-5y=15
3x+y=1

12x-5y=15
15x+5y=5

27x=20
x=20/27

3(20/27)+y=1
y+20/9=1
9y+20=9
9y=-11
y=-11/9
..................................
4a-10b=0
a+5b=1

4a-10b=0
2a+10b=2

6a=2
a=1/3

1/3+5b=1
15b+1=3
15b=2
b=2/15