Question

resolva os sistemas de equaçõe a){4x+3y=30. {2x+y=12​

Answer 1

4x+3y=30

2x+y=12​

y=12-2x

4x+3(12-2x)=30

4x+36-6x=30

-2x=30-36

-2x=-6

x=$\frac{-6}{-2}$

x=3

2x+y=12

2.(3)+y=12

6+y=12

y=12-6

y=6