Harriet has some five dollar bills and some one dollar bills She has 20 bills. The value of the bills is $72 write and solve a system of equations using elimination to find out how many of each bill she has.Show your work please. should equal 7 one dollar bills and 13 five dollar bills. Also use ALGEBRA.

Answers

Answer 1

Answer: so let's say
x=number of five dollare bills
y=number of 1 dolar bills

20 bills total
x+y=20

totla is 72 monies
72=5 times x+1 times y=5x+1y=5x+y
solve

x+y=20
5x+y=72
from here you could do 2 things: go to option 1 (longer) or option 2 (shorter)

1.

x+y=20
subtract x from both sides
y=20-x

5x+y=72
subtract 5x from boths ides
y=72-5x
subsitute

y=20-x=y=72-5x
20-x=72-5x
add 5x to both sides
20+4x=72
subtract 20 from both sides
4x=52
divide both sides by 4
x=13

subsitute
x+y=20
13+y=20
subtract 13
y=7

2.

another way is when you got 5x+y=72 and x+y=20
you negative the second equaiton and add to th efirst
I know it sounds like voodo at first but it works
-(x+y=20)=-x-y=-20
add

5x+y=72
-x-y=-20 +
4x+0y=52
4x=52
divide both sides by 4
x=13

subsitute
x+y=20
13+y=20
subtract 13
y=7

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The table can be used to determine the solution of equations, 2x − 2y = 6 and 4x + 4y = 28.A table with 6 columns and 2 rows. The first column, Original System has 2 x minus 2 y equals 6 and 4 x plus 4 y equals 28. The second column, Equivalent System, has 4 x minus 4 y equals 12 and 4 x plus 4 y equals 28. The third column, Sum of equations in Equivalent System, has 8 x equals 40. The fourth column, Solution to System, is blank. The fifth column, New System Using Sum, has 4 x plus 4 y equals 28 and 8 x equals 40. The sixth column, Solution to New System is blank.

Which solution can be used to fill in both blanks in the table?

(2, 5)

(5, 2)
(5, −8)
(−8, 5)

Answers

Answer:

$(5,2)$

Step-by-step explanation:

$2x-2y=6\n4x+4y=28$

Column 1 :

$2x-2y=6..........(1)\n4x+4y=28........(2)$

Column 2 :

Eqn(1) $*\ 2$

$4x-4y=12\n4x+4y=28$

Column 3 :

Add the equations.

$(4x+4x)-4y+4y=12+28\n8x=40$

Fourth column :

$8x=40\nx=(40)/(8)=5$

Fift column :

$4x+4y=28\n8x=40$

Sixth column :

Substitute $x=5$ .

$4* 5+4y=28\n4y=28-20\n4y=8\ny=2$

Hence solution is $(5,2)$ .

Answer:

I'm terrible at explaining so here's a screenshot

- Ripper

Step-by-step explanation:

WILL BE MARKED AS BRAINLIEST PLS JUST HELP ME!a)A local shoe store buys shoes at a wholesale price and then marks them up 80% to calculate the retail price. The wholesale price varies, depending on the quantity of shoes purchased.
b.) Using the formula from part a, calculate the retail price for each quantity range.

Answers

Answer:

since all the shoes get marked up by 80%

the equation for all of them would be :

y = new price

x = wholesale price

y = 1.8x

Step-by-step explanation:

The equation for them would be
y = the new price
x = the wholesale price
y = 1.8

Blaire needs more than 708 total points on assignments in her math class to pass. She only has 236 points and needs to do some extra credit assignments that are worth 59 points each.59x + 236 > 708

How many extra credit assignments does Blaire need to complete in order to pass?
A.
x > 236
B.
x > 59
C.
x > 472
D.
x > 8

Answers

Answer: D) x = 8

Step-by-step explanation: In order to get this answer, you need to keep the 236 and add 59 evry time until you get 708.

Another thing is to multiply 59 by 8, which will give you 472. Now we add 472 and 236 and we get 708.

59 x 8 = 472 + 236 = 708.

56 + 56 + 56 + 56 + 56 + 56 + 56 + 56 = 472 + 236 = 708.

Hope this helped!

Plz mark brainliest!

Answer:

x>8

Step-by-step explanation:

I only answered so the other guy could get brainliest.

Picture attached please answer quickly

Answers

i feel so bad for you, i don't even know that.

Answer:

The last option!!!!

Work out the value of 4(2x+3y) when x=8 and y=-3

Answers

4(2 x 8 + 3 x (-3))
4(16 + (-9))
4(7)
=28

Final answer:

To find the value of 4(2x+3y) when x=8 and y=-3, substitute the given values into the expression. Simplify the expression and solve for the value.