Question

solve each system of equations using elimination or substitution: 2x-3y=8
x+y=4
please, please, PLEASE help me... I am so confuzzled its scary!

Answer 1

Lets do substitution. Step 1: Solve x+y=4 for x. Can you do that?

Answer 2

soory was having lunch. no i do not know how to do that, but i am a fast learner and if you coud just explain i would be so happy

Answer 3

x + y = 4.....we want x on one side everything else on the other side, so subtract y from both sides and what do you get ?

Answer 4

oh...the asker just left......he/she was just here

Answer 5

must not want to learn, just wants the answer

Answer 6

no no no no no.... i was just checking on my baby sister. she fell and needed a bandaid. please stay i really do want to learn and no i dont just want the answer

Answer 7

x=4-y right?

Answer 8

please stay with me. i just need to figure this out :(

Answer 9

yes....x = 4 - y
now that we know what x is we substitute 4 - y in for x in the other equation.
can you do that ?

Answer 10

so like 2(4-y)-3y=8?

Answer 11

8-2y-3y=8

Answer 12

yes...now combine like terms

Answer 13

you need help

Answer 14

how do i combine terms?
hold on i need to get my charger.. this will take like to seconds
pease dont disappear my laptop is about to die on me:)

Answer 15

add your y's together

Answer 16

ok im back... so how do i combine terms

Answer 17

add the y's together

Answer 18

2y +3y=5y?

Answer 19

or is it -2y+3y=1y?

Answer 20

no...
8 - 2y - 3y = 8 (add the y's)
8 - 5y = 8
now we want 5y by itself so subtract 8 from both sides
-5y = 8-8
-5y = 0
y = 0/-5 which is 0
do you understand ?

Answer 21

yeah, i am following :)

Answer 22

so we know that y = 0. Now sub 0 in for y in either of your original equations to find x

Answer 23

so 2(4-0)-0=8?

8-0=8???

Answer 24

2x - 3y = 8
2x - 3(0) = 8
2x - 0 = 8
2x = 8
x = 8/2
x = 4
do you understand ?
or you could have subbed it into the other equation:
x + y = 4
x + 0 = 4
x = 4

Answer 25

wait!!! okay i think i figured it out. y=0 and x=4 once i put it as an ordered pair it makes complet and total sense!!!

Answer 26

you can check your answers by subbing in known values into either or both or your original equations...
2x + 3y = 8
2(4) + 3(0) = 8
8 + 0 = 8
8 = 8 (correct)
if the final result comes out equal, then you have the correct answers

Answer 27

ok thank you... i gotta go clean my room so bye-bye. thanks for the help

Answer 28

your welcome.....sorry about what I said earlier....I was having a bad morning

Answer 29

Is your baby sister ok ?

Answer 30

I am sure she is....have fun cleaning your room....make it a game, it makes it easier

Answer 31

thanks. you are like my math super hero right now and yeah its totally cool. i rage on people randomly all the time and yeah my sisters fine thanks bye