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Mazyrski [523]
3 years ago
13

How many solutions are there2x - y = 1- 4x + y = 1​

Mathematics
2 answers:
Bezzdna [24]3 years ago
8 0

infinitely many solutions

allsm [11]3 years ago
5 0
There are many solutions
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The cost depends upon the number of long distance minutes, m, Amy uses. Write the rule that describes Amy's monthly cost.
Yuri [45]
Minutes(m)              Cost
0                                  20
10                                22
20                                24
50                                30

slope formula:
m = (y1 - y2) / (x1 - x2)
m = (20 - 22) / (0 - 10) = -2/-10 = 1/5 or 0.20

y = (1/5)(x) + 20

The rule that describes Amy's monthly cost is:
m = 1/5x + 20 or m = 0.20x + 20

Where x is the number of minutes spent on the call.

3 0
3 years ago
Simplify the radical expression (3 + √6) (3 - √6)
Dmitry_Shevchenko [17]

Answer:

3

Step-by-step explanation:

(3 + √6) (3 - √6) = 9-3√6+3√6-6 = 9-6 = 3

(pls mark brainliest fam)

6 0
3 years ago
Read 2 more answers
Find 9P9 and 9C9. Why do the answers differ?​
sveta [45]

We have been given two expressions 9P9\text{ and }9C9. We are asked to find the value of each.

To find 9P9, we will use permutations formula.

^nP_r=\frac{n!}{(n-r)!}, where

P = Number of permutations,

n = The total number of objects in the set,

r = Number of objects being chosen from the set.

9P9=\frac{9!}{(9-9)!}

9P9=\frac{9\cdot 8\cdot 7\cdot 6\cdot 5\cdot 4\cdot 3\cdot 2\cdot 1}{(0)!}

9P9=\frac{362880}{1}                   Using 0!=1

9P9=362880

To find 9C9, we will use combinations formula.

^nC_r=\frac{n!}{r!(n-r)!}, where

C = Number of combinations,

n = The total number of objects in the set,

r = Number of objects being chosen from the set.

9C9=\frac{9!}{9!(9-9)!}

9C9=\frac{9!}{9!(0)!}

9C9=\frac{9!}{9!\cdot 1}     Using 0!=1

Cancelling out 9!, we will get:

9C9=\frac{1}{1}

9C9=1

The answers differ because order. With permutations we care about the order of the elements, while with combinations we don't.  

3 0
3 years ago
Rose’s grandmother is 89 years old. She can knit mittens somewhere between 13 and 16 hours. If she wants to knit 36 mittens for
kakasveta [241]
If it takes that long to make one pair, then i’d say maybe 468 hours to make all 36 pairs
5 0
3 years ago
Read 2 more answers
Solve d + (-d)<br><br> A. -2d<br> B. 0<br> C. d<br> D. 2d
I am Lyosha [343]

Answer:

B. 0

Step-by-step explanation:

=>d+(-d)

=>d-d

=>0

6 0
3 years ago
Read 2 more answers
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