Ask your own question, for FREE!
Mathematics 17 Online
OpenStudy (anonymous):

Help me please.. no answers please...

OpenStudy (anonymous):

OpenStudy (zale101):

So which method do you find easier and helpful for you to use. Using the substitution method or elimination?

OpenStudy (anonymous):

What ever one you think is easier to walk me through :)

OpenStudy (zale101):

I'll use substitution. To use this method, we first look at \(\color{red} {one}\) of the equation -3y-4x=21 and 4x-y=7 and try to solve for one variable, either x or y. I'll choose 4x-y=7 and I will solve for y

OpenStudy (zale101):

4x-y=7 subtract -4x to both sides -y=7-4x divide by -1 y=-7+4x y=4x-7

OpenStudy (anonymous):

is that -4 or just 4?

OpenStudy (zale101):

now, we know that y is (4x-7), plug that to the y variable in the equation -3y-4x=21 Can you do that?

OpenStudy (anonymous):

im confused what doyou mean by plug it in?

OpenStudy (loser66):

|dw:1422148653109:dw|

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
RAVEN69: My drawing so far is actually fire
1 week ago 9 Replies 2 Medals
PureSoulless: is staying at your friend's house while you're homeless legal.
2 weeks ago 5 Replies 1 Medal
whyjustwhy: i did that one TV girl trend with blake (aka @ShadowKid3)
1 week ago 12 Replies 2 Medals
whyjustwhy: i did that one TV girl trend with blake (aka @shadowkid3)
2 weeks ago 3 Replies 0 Medals
whyjustwhy: yo guys he can watch me sleep now (ignore dora)
3 weeks ago 24 Replies 1 Medal
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!