Question

solve for x and y, using substitution. 2x-y=8
x+2y=9

Answer 1

Pick one of the two equations and solve for either x or y. For example:

x + 2y = 9
x = 9 - 2y

Now plug 9 - 2y into the other equation in place of x. You can then solve that equation for y and, once you've done that, use the value of y to calculate x.

Answer 2

solve for y in the first equation. so y=2x-8. then enter it into the second equation. so x+2(2x-8)=9. solve for x and then enter your x value into the equation x+2y=9 to find your y value.

Answer 3

x+4x-16=9 ?

Answer 4

Would x=5

Answer 5

yup. now enter that into x+2y=9 to find your y value.

Answer 6

y=2

Answer 7

yup thats it

Answer 8

can you help me with some more

Answer 9

ya sure give me another

Answer 10

y=2x+1 and y=3x-7, I think i found out x

Answer 11

ok so do 3x-7=2x+1
x will come out to x=8

Answer 12

now enter that value into one of the equations given to find y

Answer 13

1x-7=1?

Answer 14

yes. add the 7 to the other side so that x is by itself and you get x=8

Answer 15

Nevermind its 17, right?

Answer 16

is it 8?

Answer 17

ur killin me dude. 7+1=8. haha maybe a typo or somthin

Answer 18

ya haha

Answer 19

y = 17 my bad. nice

Answer 20

alright thanks, I have like 3 more problems. sorry im really bad at math

Answer 21

ok

Answer 22

3x+y=4 and -6x-2y=12

Answer 23

the easiest way would be to solve for the y in the first equation. so y=4-3x

Answer 24

now enter that into the second equation

Answer 25

ok hold on

Answer 26

-6x-2(4-3x)=12 solve for x

Answer 27

x-8=12 ?

Answer 28

well since -6x-8+6x=12. the x cancels out so you are left with -8=12. this means that there is no solution to the problem

Answer 29

the answer is "no solution"

Answer 30

Oh ok

Answer 31

you got that.

Answer 32

did u have one more

Answer 33

2 more, y=x+1 and x=y-1

Answer 34

ok

Answer 35

since u already have an x or y solved for, pick one to put into the other equation. so im gonna enter the y one in for the y in the x equation. so x=(x+1)-1.

Answer 36

2= -x ?

Answer 37

huh well sorry but for some reason this one is stumping me.
give me the next one and i will come back to it

Answer 38

ok, 8x-6y = 22 and x-3y=-4

Answer 39

ok so solve for x in the second one. x=3y-4. enter it into the first one so 8(3y-4)-6y=22. solve for y.

Answer 40

y=3

Answer 41

yup nice. now enter that back in to get x

Answer 42

ok

Answer 43

x= 9-4 ?

Answer 44

yup exactly

Answer 45

x=5

Answer 46

yup now for that last one. i figured it out by just looking at it. x=-2 and y =-1. i cant really explain it though. when i try to solve for it i must be making a lil mistake. but if u enter those nunbers in they work so sorry i cant walk ya through it

Answer 47

its okay and thanks

Answer 48

ok have a good night

Answer 49

you too