Question

solve by eliminating method 3x + y =12 and x - 3y = -6​

Answer 1

Answer:

Step-by-step explanation:

3x +y = 12    .........................1

x- 3y = -6    ...........................2

multiply equation 1 by 3

9x + 3y = 36

x - 3y = -6

Add the equations

10 x = 30

x = 3

And

x - 3y = -6

30 - 3y = -6

3y = 36

y = 12

Regards.........

Answer 2

Answer:

Given 3x+y = 12 eq 1

x - 3y = - 6 eq 2

Multiply eq 2 by 3

3x - 9y = - 18 eq 3

Subtract eq 1 from eq 3

3x-9y =-18

-3x - y= - 12

-10y = - 30

Y= 3

Put y =3 in eq 2

x-9 = - 6

x =3