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Algebra Videos 32 videos

ACT Math 1.5 Intermediate Algebra
386 Views

ACT Math Intermediate Algebra Drill 1, Problem 5. Can you simplify the expression?

ACT Math 2.1 Intermediate Algebra
359 Views

ACT Math Intermediate Algebra Drill 2, Problem 1. Solve the equation.

ACT Math 3.3 Elementary Algebra
233 Views

ACT Math Section: Elementary Algebra Drill 3, Problem 3. Solve for x.

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Solving Equations with Variables on Both Sides Example 16951 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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