Question

how do i solve 3x+y=8

Answer 1

are you trying to solve for x? or for y?

Answer 2

I don't really know what to do 3x+y=8 5x-y=8

Answer 3

oh, its simultaneous equations,

Answer 4

y=2-3x/4

Answer 5

3x+y = 8
5x-y = 8

add the equations together

(3x+y) + [5x-y]= (8) + [8]

and simplify, the y-terms will drop out

Answer 6

take 3x rght hand side

Answer 7

(3x+y) + [5x-y]
= 3x+y + 5x-y
= 3x+5x+y -y
=

Answer 8

okay I did that what now

and is are yhu guys on here to help everyday

Answer 9

is any body on here still

Answer 10

= 3x+5x+y -y
= (3+5)x+(1-1)y
=

Answer 11

am I done now unklerhaukus

Answer 12

what does it simplify to ?

Answer 13

umm is it 8x+y

Answer 14

almost, but (1-1) is not 1

Answer 15

okay how about 8x+(-9) is that Is that it

Answer 16

what is one, take away one?

Answer 17

okay that is 0 so I get 8x+0 right

Answer 18

yeah
(3x+y) + [5x-y]
= 3x+y + 5x-y
= 3x+5x+y -y
= 8x+0

Answer 19

so you have 8x = 8+8

can you solve this for x?

Answer 20

okay I divide by 8 right and then I get x=-8 am I right

Answer 21

8x = 8+8
if you divide by 8
you'll get
x = 1 +1

Answer 22

okay my answer is x=2 right

Answer 23

yes

Answer 24

good, now we have x, we can find y,

Answer 25

lets plug in x = 2 into that first equation

3x+y = 8

2(2) +y =8

solve this for y

Answer 26

is y 2
thanks a lot

Answer 27

**whoops

3(2) +y =8

Answer 28

okay does y = 2 then

Answer 29

yes!

Answer 30

Lets check our solution

we got x=2, y=2

3x+y = 8
5x-y = 8

if we these in both these equations should be true

3(2)+(2) = 8
5(2)-(2) = 8

are these both right?

Answer 31

yes they are are we done now

Answer 32

yep, good work

Answer 33

okay THANK YHU A LOT I REALLY NEED THE EXTRA HELP IN MATH BYE

Answer 34

write your solution as either x=2, y=2 or (x, y) = (2, 2)

Answer 35

bye : )