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lapo4ka [179]
4 years ago
9

3. Two lines or equations are described in each part. Decide whether each system has one solution, no solution, or infinitely ma

ny solutions. Show your work or explain your reasoning.
(a) Line a has a rate of change of 7.
Line b has a rate of change of -7



(b)2x+3y=5.5
4x+6y+11




(c) Line c and line d are parallel
Mathematics
2 answers:
igomit [66]4 years ago
4 0
A)  slope is 7 for 1 and -7 for the other.  These lines intersect in 1 point only

b) both equations have slope -2/3 and the same intercept, so it is really only one line...infinite solutions

c) parallel lines have 0 solutions
Svet_ta [14]4 years ago
3 0
A) One Solution
B) Infinite Solutions
C) No Solutions
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If x+y=12and x-y=8, what is the value of 2x-xy?
slamgirl [31]

Answer:

2x - xy = 0

Step-by-step explanation:

We need to solve the equations simultaneously to find the values of x and y:

x + y = 12

x - y = 8 - we need to add the equations together

2x = 20

x = 10

Then we substitute x into one of the equations to find y:

10 + y = 12

12 - 10 = y

y = 2

Now we substitute x and y into the final expression:

2(10) - 2(10)

20 - 20 = 0

8 0
3 years ago
What is the surface area of this shape?<br> 1 cm<br> 5 cm<br> 4 cm<br> 2 cm<br> 6 cm<br> 3 cm
djyliett [7]
I don’t know I think it’s 6cm
3 0
3 years ago
P varies directly with the square of R. When R is 4, P is 56. Find the value of P when R is 6
Sav [38]
Hey!
The formula of direct variation is y = kx. So we know that p = kr^2
Hint: after it says varies, it's basically the equal sign. 
so we can set it up
56 = 4^2k
56=16k
now we want k alone so we have to divide 16 on both sides
k=3.5
We can now solve for p like it asks
p = 3.5*6^2
p=126
There's your answer!
Hope this helps!
6 0
3 years ago
I NEED THIS Which equation represents a line that has a slope of 2 and passes through the point (1,-3)
s2008m [1.1K]

Answer:

well..the only equation is thats wrote right is(D)

Step-by-step explanation:

i wasnt sure if that was the correct answer and the way to know is by using  i personally think which is desmos graphing calculator you can type in your equation and it graphs the line for you

8 0
3 years ago
Before leaving to visit Mexico, Levant traded 270 American dollars and received 3,000 Mexican pesos. When he returned from Mexic
erica [24]

The amount of dollars that Mr. Levant would exchange for 100 pesos on his return is <u>$9</u>.

<h3>What is an exchange rate?</h3>

An exchange rate is a rate that is used to convert one nation's currency to another.

The exchange rate is based on the purchasing power of each nation's currency.

<h3>Data and Calculations:</h3>

Dollars before traveling to Mexico = $270

Value of Mexican pesos received for $270 = 3,000 pesos

Exchange rate = $1 = 11.11 pesos (3,000/$270)

Amount of pesos left after the trip = 100 pesos

Value of 100 pesos in dollars = <u>$9</u> (100/$11.11)

Thus, the amount of dollars that Mr. Levant would exchange for 100 pesos on his return is <u>$9</u>.

Learn more about exchange rates at brainly.com/question/2202418

#SPJ1

4 0
1 year ago
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