Posted by **kim** on Friday, February 24, 2012 at 9:17pm.

solve by the substitution method. 6x+3y=-21 -4x+y=41

- algebra -
**luther**, Friday, February 24, 2012 at 10:49pm
there are so many ways of doing this problem! you can solve for x or y.

let's solve for x.

take -4x+y=41

when u solve x= 1/4y-41/4

plug that value of x into the other equation: 6x+3y=-21

it should look like this

6(1/4y-41/4)+3y=-21 and solve for y

after u solve for y

plug it in to whatever equation & solve for x and then u check it.

you can do it vice versa & solve for y first if you want too:)

- algebra -
**Reiny**, Friday, February 24, 2012 at 10:50pm
from the 2nd: y = 41-4x

sub into the 1st:

6x + 3y = -21

6x + 3(41-4x) = -21

6x +123 - 12x = -21

-6x = -144

x = 24

sub into y = 41-4x = 41-4(24) = -55

x = 24

y = -55

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