Question

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

Answer 1

substitution or elimination?

Answer 2

WHATS THAT?

Answer 3

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

Answer 4

Idk if I ever learned that!

Answer 5

eliminatioin

Answer 6

**elimination

Answer 7

help!(:

Answer 8

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

Answer 9

i will also explain that

Answer 10

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

Answer 11

key

Answer 12

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

Answer 13

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

Answer 14

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

Answer 15

please tell me what distribute means

Answer 16

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

Answer 17

YES
so distribute the equation i gave above...

Answer 18

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

Answer 19

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

Answer 20

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

Answer 21

do you subtract 2y from 15y?

Answer 22

yes...

Answer 23

and you get 18?

Answer 24

@SnuggieLad ?

Answer 25

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

Answer 26

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

Answer 27

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

Answer 28

@snuggielad ?

Answer 29

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

Answer 30

+

Answer 31

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.