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Serhud [2]
3 years ago
6

Solve the system by substitution. Use parenthesis and no spaces in your answer.

Mathematics
1 answer:
Debora [2.8K]3 years ago
5 0

First equation: -8x+7y=-17

Second equation: y=2x+1

Take the value of y from the second equation, as y is already isolated, and plug it in for y in the first equation. Simplify and solve for x.

-8x+7(2x+1)=-17

-8x+14x+7=-17

6x+7=-17

6x=-24

x=-4

Take the value of x we just found and plug it into the first equation. Solve for y.

-8(-4)+7y=-17

32+7y=-17

7y=-49

y=-7

Hope this helps!! :)

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A rectangle has an area of (x^3+x^2-7x+2) square meters and width of (x-2) meters. Find its length.
Phoenix [80]
A=l*w
=> A/w=l
you have to perform polynomial division
l=x^2+5x+13+54/(x-4)

4 0
4 years ago
What is the solution of -27 = m/9 ?<br><br>A. -243<br><br>B. -3<br><br>C. 3<br><br>D. 243​
asambeis [7]
Answer: m = -243



Explanation:

• Solve

-27 = m/9


•Multiply 9 by 27

m/9 * -27

• Result

m = -243





8 0
4 years ago
Read 2 more answers
Monica has $340 in the bank and plans to save $10 per week. is this linear or exponential?
riadik2000 [5.3K]

Answer:

linear. Each week adds another 10 dollars.

Step-by-step explanation:

Total = 340 +  10*w

w is the weekly amount

Suppose 5 weeks pass

Then the total amount in her bank account is

Total = 340 + 10*5

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Total = 390

The equation is Linear.

5 0
3 years ago
A 5% destroys solution is given intravenously. Suppose a total of 2.64 L of the solution is given over a 19-hour period. What is
kow [346]

Answer:

The flow rate is 138.95 mL per hour.          

Step-by-step explanation:

We are given the following in the question:

Volume of solution = 2.64 L

1 L = 1000 mL

Volume of solution in mL =

2.64\times 1000 = 2640\text{ ml}

Time period = 19 hour

Unit rate of flow =

=\dfrac{\text{Volume}}{\text{Time period}}\\\\=\dfrac{2640}{19}\\\\=138.95\text{ mL per hour}

Thus, the flow rate is 138.95 mL per hour.

5 0
3 years ago
Find the surface area of a sphere that has a volume of 288 cu. in. 48 144 20,736
Liula [17]
V=(4/3)pir^3
SA=4pir^2

so

V=288=(4/3)pir^3
times both sides by 3/4
216=pir^3
divide both sides by pi
216/pi=r^3
cube root both sides
6/(∛pi)=r

sub into other
sa=4pir^2
sa=4pi(6/(∛pi))^2
SA=4pi(36/(∛(pi²)))
SA=144pi/(∛(pi²))
SA=144pi∛pi/pi
SA=144∛pi
SA≈210.901 in²
not sure what option that's supposed to be
6 0
3 years ago
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