Question

solve equation by substitution method 3x- y =3,9x-3y = 9​

Answer 1

Answer:

Step-by-step explanation:

3x-y=3  -------1

9x-3y=9  -----2

From equation one we get -y=3-3x

So, y=3x-3

Now substituting this value of y in equation 2 we get

9x-3(3-3x)=9

9x-9+9x=9

18x-9=9

18x=18

So x=1

now putting this back in equation 1 we get

y=3(1)-3

y=3-3

y=0