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Solving Equations with Variables on Both Sides Example 16948 Views


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Transcript

00:00

Thank you multistep equations with variables on both sides ah

00:07

la shmoop running the reindeer has always tried to follow

00:10

in the footsteps of his brother rudolf every year rudolph

00:14

by santa and expensive new hat out of the goodness

00:18

of his heart rudolph gives running exactly half his cash

00:22

so they'll have the same amount to spend on christmas

00:25

gifts on the way to the sugar plum all acute

00:28

victim recognizes rudolph and offers to give him seven dollars

00:32

to take a photo with he and his famous knows

00:35

rudolph doesn't want running to feel left out so he

00:37

pays the vixen two dollars to take a photo with

00:40

running in his slightly less famous schnoz Well rudolph even

00:43

asked the vixen teo give the seven dollars to running

00:46

instead we'll check out running has exactly enough money to

00:49

purchase two hats while rudolph has exactly enough to buy

00:53

one Can you determine the price of one of these

00:57

hats Hoof a lot of information Well it'll help to

01:00

be able to solve this sort of problem however because

01:02

the type of situation that pops up a lot in

01:04

real life first we need to determine the variable we're

01:07

going to use way don't know how much money each

01:09

reindeer started with but we do know that they started

01:12

with the same amount since the problem tells us that

01:15

rudolph gave half is cash to running before they headed

01:19

out So let's call their starting cash ex same for

01:22

both Then rudolph gave two dollars to the cute vixen

01:26

so ex minus two running on the other hand received

01:30

seven dollars from his fangirl So x plus seven goes

01:34

there However we're also told that running is able to

01:37

buy twice as many hats Is rudolph after this little

01:40

exchange which means that we'd have to multiply the expression

01:43

for rudolph by two has set he's equal to one

01:47

another So two times the quantity x minus two equals

01:51

x plus seven multiplying that two on the left hand

01:54

side we get to x minus four equals x plus

01:57

seven Of course we want to get x by itself

02:00

so we know how much cash all of these guys

02:02

started with so we can subtract x from both sides

02:05

to get x minus four equals seven then had four

02:08

to each side to get x equals eleven And there

02:11

we have it Each ranger started their shopping trip with

02:14

eleven bucks but that's not what the questions asking We

02:18

know that rudolph gave away two dollars and still had

02:20

exactly enough money to buy one hat itself He started

02:24

with eleven bucks and gave way to box leaving himself

02:26

with nine box Then each hat must run nine dollars

02:31

on the button We can double check to see if

02:33

that's correct by plugging the same number in the runnings

02:35

equation We started with eleven dollars and the vixen gave

02:38

him another seven giving him eighteen dollars total And sure

02:42

enough eighteen divided by nine is too meaning Running would

02:45

have had exactly enough cash to buy two hats It's

02:49

like santa has a new favorite this year This allergy 00:02:52.87 --> [endTime] season strikes

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