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sergiy2304 [10]
3 years ago
7

What would you multipy and to which equation to start solving by using the elimination method? Then would you add or subtract th

em?
7x + 4y = -4
5x + 8y = 28
Mathematics
1 answer:
tester [92]3 years ago
8 0

Answer:

multiply the first equation by -2, then add them

Step-by-step explanation:

7x+4y=-4         *-2 7x+4y=-4 *-2 = -14x-8y=8

5x+8y=28

-14x-8y=8                       x=-4, y=6

-9x=36

x=-4

7(-4)+4y=-4

-28+4y=-4

4y=24

y=6

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jasenka [17]

Answer:

y  = 2x+10

Step-by-step explanation:

y is the cost (which we don't know)

2x is the $2 per card with x representing the number of cards (which we don't know)

And of course 10 is the cover charge.

4 0
4 years ago
The polynomial p(x)=3x^3-5x^2-4x+4 has a known factor of (x-2)
Nikolay [14]

Answer:

3x^2-x-2 or (x+1) (3x-2) (x-2)

Step-by-step explanation:

I'm assuming you have to divide:

(x-2)\sqrt{3x^3-5x^2-4x+4}

     

Hope this helps.

6 0
3 years ago
How many years will it take each situation to double its money? Situation A: Matthew invests $5,000 in an account with a compoun
algol [13]

Answer:

Matthew's money will double fastest in 6 years.

Step-by-step explanation:

<u><em>The complete question is</em></u>

Answer the question for each scenario<u><em> by applying the rule of 72</em></u>. How many years will it take each situation to double its money? Situation A: Matthew invests $5,000 in an account with a compound interest rate of 12%. Situation B: Morgan invests $2,500 in an account with a compound interest rate of 8%. Situation C: Maysen invests $10,000 in an account with a compound interest rate of 4.5%. Whose money will double fastest?

we know that

The <u><em>Rule of 72</em></u> is a simple way to determine how long an investment will take to double given a fixed annual rate of interest. By dividing 72 by the annual rate of return.

so

Situation A: Matthew invests $5,000 in an account with a compound interest rate of 12%

\frac{72}{12}=6\ years

Situation B: Morgan invests $2,500 in an account with a compound interest rate of 8%.

\frac{72}{8}=9\ years

Situation C: Maysen invests $10,000 in an account with a compound interest rate of 4.5%

\frac{72}{4.5}=16\ years

therefore

Matthew's money will double fastest in 6 years.

7 0
3 years ago
The diameter of a circular park is 98 m. Find the cost of fencing it at $4 per meter
oksano4ka [1.4K]

Answer:

Answer. circumference = 151 m ( appr.) Ans :- The cost of fencing is Rs 604 .

6 0
3 years ago
the length and width of a rectangle are consecutive integers. If the area of the rectangle is 90cm^2 , what is the primeter of t
Genrish500 [490]

Answer:

Step-by-step explanation:

Let length and width of a rectangle be  x, x+1

Area = 90 sq.cm

length * width = 90

x * (x + 1) = 90

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x = 9

Length = 9 , width = 10

4 0
4 years ago
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