Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the first equation is substituted into the second equation. 12x - y = -4
4x - 3y = -6

Answer 1

A= 4x - 3(-12x - 4) = -6

B= 4x - 3(12x + 4) = -6

C= 4(12x + 4) - 3y = -6

D= 4(-12x - 4) - 3y = -6

Answer 2

plz helo me

Answer 3

look at your first equation 12x - y = -4.
Can you solve for y ?

Answer 4

I really dont even know where to start

Answer 5

12x - y = -4 --- add y to both sides
12x - y + y = -4 + y --- combine like terms
12x = -4 + y --- now add 4 to both sides
12x + 4 = -4 + 4 + y --- combine like terms
12x + 4 = y

are you still with me ?

Answer 6

now that we know y = 12x + 4, we can sub that in for y in the other equation
4x - 3y = -6
4x - 3(12x + 4) = -6

Understand ?

Answer 7

thanks

Answer 8

no problem :)