Question

Solve the system using elimination.

x = –4 + 3y
12y = 21 + 3x

Can someone please go step by step for me? Thank you

Answer 1

y = 3 and x = 5

Answer 2

Thank you

Answer 3

in elimination method first make the coefficients of any two variables same by mutiplying a number, then add or subtract themm to eliminate a variable. last get the values.

Answer 4

to solve simultaneously you put them in the form x + y = number

that is, put the variables like x and y on the left hand side and the constant on the right.

so in this case it would look like:--> x -3y = -4
3x -12y = -21

after this you need to get rid or/eliminate one of the variables...i'll eliminate x so i'll be left with y.

since the x terms need to be the same to be elimated, multiply the top eq. by 3 so that you get:

3x -9y = -12
- 3x -12y = -21
_____________________

then atter subtracting those two eqs you get 3y = 9

and y = 3

then substitute back into the original eq: x - 3(3) = -4

so : x -9 = -4

and x = 5