Question

Solve the system by the method of substitution.

Solve system by graphing
3y = –1/2x + 2
y = –x + 9

Answer 1

Will give medal

Answer 2

for this question do you need a graph

Answer 3

no

Answer 4

ok so you just need help with the answer

Answer 5

yes plz

Answer 6

what math subject are you doing at the moment

Answer 7

Algebra 2

Answer 8

ok now i know what to do

Answer 9

just before i start are there option choices

Answer 10

ok nvm so you start of by combining the equation

Answer 11

\[4y = -1/2x+12\]

Answer 12

o sry u left so i went to grab a bite and yes there are ansew choices

Answer 13

*answer

Answer 14

no worries its fine

Answer 15

what how did u get the 4y equation

Answer 16

combine 3y and y, y by itself equals 1

Answer 17

(3, 6)

(20, –4)

(10, –1)

(–1, 8)

Answer 18

those are the answer choices

Answer 19

so nvm don't combine anything

Answer 20

solve it one step by a time

Answer 21

plug them into the equation

Answer 22

\[3y =1/2x +2\]

Answer 23

try solving that

Answer 24

kk

Answer 25

i cant because 1/2 divided by 3

Answer 26

you know y = -x + 9, so substitute that in for y in the first equation

Answer 27

substitute what for y

Answer 28

the bottom equation tells you y = -x + 9

so put (-x + 9) in wherever you see y in the top equation

Answer 29

o kk

Answer 30

what do you get?

Answer 31

-3x-27=-1/2x+2

Answer 32

3(-x + 9) =

-3x + 27 = -1/2x + 2

you were close, just flipped the signs in front of the 27

Answer 33

so no you can solve for x

Answer 34

now*

Answer 35

so in order for me to solve for x just take the point and put the in

Answer 36

sry im still a little confused

Answer 37

so now you have
-3x + 27 = -1/2x + 2

and you want to solve for x now

so first get the x's on the left side, and move everything else to the right side

Answer 38

so i would add 1/2

Answer 39

yup, do what's -3 + 1/2 ?

Answer 40

so*

Answer 41

-2 1/2

Answer 42

yes, which is -5/2, so now you have

-5/2x + 27 = 2

you have to get x by itself so subtract 27

Answer 43

- 27 5/2 = 2 ?

Answer 44

-5/2x = -27 + 2

Answer 45

lol sry

Answer 46

it's okay. what does the equation look like now?

Answer 47

i put it in decimal form bcz i suck at fractions and i got 29.5

Answer 48

-27 + 2 = -25
so you have

-5/2x = -25

Answer 49

so for me to get x by itself just add 5/2

Answer 50

no, you first have to multiply both sides by 2 so you get

-5x = -25 * 2

Answer 51

? sry im confused you don't have to keep helping if u dont want to sry

Answer 52

when you have a fraction in front of a variable, like -5/2x = -25

you need to get x by itself right?

so you have first mulltiply both sides by 2 to get ride of the 2 on the bottom

so youre left with -5x = -25 * 2

= -50

Answer 53

so then you have -5x = -50

but you still have a -5 in front, so you have to divide by -5 now

x = -50 / -5

x = 10

Answer 54

Thank you sry for taking so much of your time

Answer 55

it's okay. youre not done yet though. you have to put x = 10 in to x in the bottom equation and solve for y.

Answer 56

o kk

Answer 57

what did you get?

Answer 58

19

Answer 59

y = -(10) + 9

y = -10 + 9

y = -1

Answer 60

o the negative

Answer 61

thx

Answer 62

yeah, gotta be careful with those

Answer 63

lol

Answer 64

you're welcome!