All categories

2 years ago

Solve each system by elimination. 1) 10x + 7y=9 -4x - 7y=9

Mathematics

1 answer:

stellarik [79]2 years ago

8 0

Answer:

(3, -3)

Step-by-step explanation:

When asked to solve by elimination, you put them on top of one another, like you're going to add it.

10x + 7y = 9

-4x - 7y = 9

See that 7y? You can cancel those out because one is negative, and one is positive. So those are gone. You finish adding the rest of the numbers as usual and solve for x.

6x = 18

x = 3

Take x, and plug it into either equation to find y.

10(3) + 7y = 9

7y = -21

y = -3

(3, -3)

Hope this helped!

You might be interested in

One acre is equivalent to 43,560 square feet. If an acre is also equivalent 1o 4,840 square yards, how many square yards, how ma

qwelly [4]

9 sq ft = 1 sq yd

There's 3ft in a yard sq means 3x3=9
Check 4840 sq yds x9= 43,560 sq ft

8 0

2 years ago

Help me with this one

stepan [7]

You need to multiply by 10 2 times.

6 0

3 years ago

Read 2 more answers

Identify the coefficient(s), constants, and number of terms for the following expression:

Talja [164]

The given expression is: $3 x^{2} -7x+2$

There are 3 terms in this expressions:
1) $3 x^{2}$
2) $-7x$
3) 2

The coefficient of $3 x^{2}$ is 3.
The coefficient of $-7x$ is -7.
The constant term is 2.

8 0

3 years ago

Suppose an initial investment of $100 will return $50/year for 3 years (assume the $50 is received each year at the end of the y

nydimaria [60]

With a positive NPV, it shows that the investment is profitable.

It is a profitable investment with a positive NPV at a discount rate of 20%.

Data and Calculations

Initial investment = $100

Annual cash inflows = $50

Period of investment = 3 years

Discount rate = 20%

<h3>What is the present value?</h3>

Present value (PV) is the current value of a future sum of money or stream of cash flows given a specified rate of return.

Present Value (PV) annuity factor for 3 years at 20% = 2.106

Present value of annual cash inflows = $105.3 ($50 x 2.106)

Net Present Value (NPV) = $5.3 ($105.3 - $100)

Thus, with a positive NPV, it shows that the investment is profitable.

To learn more about the investment visit:

brainly.com/question/12957049

#SPJ1

4 0

1 year ago

Hello i really need help with this as you can see i am kinda dumb

andrew11 [14]

Answer:

The answer to your question is 17, -5, 10

Step-by-step explanation:

Coefficients are the numbers that come before a variable (letter) like x, y or z.

In your question

17 is the coefficient of 17x

-5 is the coefficient of -5y

10 is the coefficient of 10z

In this problem, there are 3 variables and then there are 3 coefficients.

8 0

2 years ago