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masha68 [24]
3 years ago
10

PLS HELP! - x + 4y = -9 y = -2x + 6 Is (2,3) a solution of the system?

Mathematics
1 answer:
skelet666 [1.2K]3 years ago
8 0
Answer is no!!!
...........
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Two teachers purchase supplies for their classrooms.
inna [77]

Answer:

Cost of One Journal =  $3.99

Cost of One pen =  $0.59

Step-by-step explanation:

Let

Cost of One Journal = x

Cost of One pen = y

We can make equation from given statements.

Mr. Bowden purchases 18 journals and 40 pencils for $95.42.

18x+40y=95.42

Ms. Jacinto purchases 11 journals and 16 pencils for $53.33.

11x+16y=53.33

Now solving these equations to find the value of x

18x+40y=95.42--eq(1)\\11x+16y=53.33--eq(2)

Multiply eq(1) with 2 and eq(2) with 5

36x+80y=190.84\\55x+80y=266.65\\-\:\:\:\:-\:\:\:\;\:\:\:\:\:\:\:-\\---------\\-19x=-75.81\\x=\frac{-75.81}{-19}\\x=3.99\\

We get the value of x is: x=3.99

Now, putting value of x in equation 1 to find value of y.

18x+40y=95.42\\18(3.99)+40y=95.42\\71.82+40y=95.42\\40y=95.42-71.82\\40y=23.6\\y=\frac{23.6}{40}\\y= 0.59

So, we get the value of y: y = 0.59

Now, finding the costs:

Cost of One Journal = x = $3.99

Cost of One pen = y = $0.59

7 0
3 years ago
Luis took out a 3 year loan for $4500 at a furniture store to be paid back
SVETLANKA909090 [29]

Answer:

$1252.13

Step-by-step explanation:

15.9% = .159

$4500 multiplied by .159 = $715.50

3 yrs = 36 months

36 months - 15 months = 21 months

21 months = 1.75 yrs.

$715.50 multiplied by 1.75 = $1252.13

7 0
3 years ago
Read 2 more answers
Evaluate f(x) = -x to the second power + 1 for x = -3
professor190 [17]
I think it's 4 Yeah 4 something like that
5 0
3 years ago
which ordered pair (x,y) is a solution to the given systems of linear equations? 3x+3y=-3 and -2x+y=2
Ulleksa [173]
3x+3y=-3
divide both sides by 3 for ease
x+y=-1

now eliminate x's
multiply that equation by 2 and add to other one

2x+2y=-2
<u>-2x+y=2 +</u>
0x+3y=0

3y=0
y=0

x+y=-1
x+0=-1
x=-1

(x,y)
(-1,0)
4 0
3 years ago
2(p+1)=16 <br><br> A. 7 <br><br> B. 7.5 <br><br> C. 8.5 <br><br> D. 9
dexar [7]
What exactly are we trying to work out here?
7 0
3 years ago
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