OpenStudy (anonymous):

Solve for X and Y: 4X-3Y=3 5X=2Y=-25.

4 years ago
OpenStudy (ryan123345):

substitution or elimination?

4 years ago
OpenStudy (anonymous):

WHATS THAT?

4 years ago
OpenStudy (johnweldon1993):

you should read up on both those terms @ryan123345 said before you even approach this problem

4 years ago
OpenStudy (anonymous):

Idk if I ever learned that!

4 years ago
OpenStudy (anonymous):

eliminatioin

4 years ago
OpenStudy (anonymous):

**elimination

4 years ago
OpenStudy (anonymous):

help!(:

4 years ago
OpenStudy (snuggielad):

stamp thanks...she is apperantly having trouble understanding what she is learning...(no offence) this is a two step equation...i will show you wat substitution means and then i want you to give us...i mean all the people watching what you post an honest reply...that you try your best to solve it... 5(4X-3Y)+2Y=-25 try to solve that...and i will help you with the rest

4 years ago
OpenStudy (snuggielad):

i will also explain that

4 years ago
OpenStudy (snuggielad):

its addition stamp...she hit the plus and equal sign

4 years ago
OpenStudy (snuggielad):

key

4 years ago
OpenStudy (anonymous):

Ya'll are confusing me even more! )': *crying*

4 years ago
OpenStudy (snuggielad):

hold on stamp i will help her through this one...she only needs one persont trying to teach her at a time

4 years ago
OpenStudy (snuggielad):

ok...are you listening in class? because you really should be learning these words ... do you know what the mathmatic definition of distribute means? if you dont than there is really nothing i can do...stamp cant help eaither...you need to go to your teacher and ask her...there is only so much we can do without stepping over the code of conduct here...i can NOT phisically give you another answer without being banned

4 years ago
OpenStudy (snuggielad):

please tell me what distribute means

4 years ago
OpenStudy (anonymous):

it means the number outside the ( ) is multiplied by what is inside

4 years ago
OpenStudy (snuggielad):

YES so distribute the equation i gave above...

4 years ago
OpenStudy (snuggielad):

5(4X-3Y)+2Y=-25

4 years ago
OpenStudy (anonymous):

so it would be 20x-15y+2y=25

4 years ago
OpenStudy (snuggielad):

the 25 would still be negitive but yes...exactly...now solve THAT equation

4 years ago
OpenStudy (anonymous):

do you subtract 2y from 15y?

4 years ago
OpenStudy (snuggielad):

yes...

4 years ago
OpenStudy (anonymous):

and you get 18?

4 years ago
OpenStudy (anonymous):

@SnuggieLad ?

4 years ago
OpenStudy (snuggielad):

dont tell anyone i did this but x=-3 and y=-5 GO TO YOUR TEACHER TMR...ask her...i cant explain it in text

4 years ago
OpenStudy (anonymous):

m,y teacheer wont help... and this is due first thing tomorrow ):

4 years ago
OpenStudy (anonymous):

@SnuggieLad wuld yhu be able to explain over the phone? like call me?

4 years ago
OpenStudy (anonymous):

@snuggielad ?

4 years ago
OpenStudy (anonymous):

Is the second equation 5x - 2y = -25 or is it 5x + 2y = - 25 ?

4 years ago
OpenStudy (anonymous):

+

4 years ago
OpenStudy (anonymous):

4x - 3y = 3 --> (5)4x - 3y = 3 5x + 2y = - 25 -->(-4)5x + 2y = - 25 ----------------- 20x - 15y = 15 (result of multiplying by 5) -20x - 8y = 100 (result of multiplying by -4) ---------------- 0 - 23y = 115 -23y = 115 y = 115/-23 y = -5 now sub 5 in for y in either of the original equations 4x - 3y = 3 4x - 3(-5) = 3 4x + 15 = 3 4x = 3 - 15 4x = -12 x = -12/4 x = - 3 now lets check... 4x - 3y = 3 4(-3) - 3(-5) = 3 -12 + 15 = 3 3 = 3 (correct) answer is x = -3 and y = -5 This is the elimination method. What you have to do in this method is try to cancel out one of your variables. It can be either one, x or y. I chose to cancel out x's. To do this, you have to make your variables opposite...one has to be negative and one has to be positive. I multiplied the first equation by 5 and the 2nd equation by -4 and by doing this, I made the x's opposite so they will cancel out. This allowed me to solve for y. Once y was solved I substituted the value I got for y into the original equations and solved for x. I then plugged in my answers into the equation and checked my answers.

4 years ago