Friday

April 18, 2014

April 18, 2014

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

- algebra -
**luther**, Friday, February 24, 2012 at 10:49pmthere 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 10:50pmfrom 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

**Related Questions**

algebra - Solve using the substitution method 6x-3y=18, 6x+3y=-12

Math - How do I solve these problems, I really need help. Solve by substitution ...

Algebra - solve by substitution method y=x-4 6x-9y=21

Algebra - x-2y=.9 4x-3y=13.1 Solve using the substitution method.

Algebra - 4x+y=42 6x-5y=50 Solve using the substitution method.

Algebra - Solve the system of linear equations using the substitution method. 3x...

collage algebra 1 - solution by the substitution method: 4x + 3y =9 3y + 6 = x

Math 2 questions - Use the substitution method to solve each linear system: -x+...

TO ANY MATH HELPERS - Pleeeese help! Use the substitution method to solve each ...

Algerbra 1 substitution method - im really confused about this question: 2x-3y=...