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guajiro [1.7K]
3 years ago
8

What is the value of x in the solution to this system of equations?

Mathematics
1 answer:
siniylev [52]3 years ago
8 0

Answer:

D) x=9

Step-by-step explanation:

x = 2y- 5

2y = x + 5

y = (x+5) / 2

4x + 7(x+5)/2 = 85

8x + 7x + 35 = 85*2

15x + 35 = 170

15x = 170 - 35 = 135

x = 135/15 = 9

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Write a polynomial function that meets the stated conditions.The zeros are −1, 2, and 7.
kondaur [170]

Answer:

A polynomial function that meet the conditions is x³ - 8x² + 5x + 14 = 0

Step-by-step explanation:

Hi there!

Let´s start writting a generic factored function. In this case, the function has 3 zeros so that the factored form will have 3 terms:

(x + a)(x + b)(x + c) = 0

For this expression to be 0, either (x+a) = 0 or (x+b) = 0 or (x+c) = 0

Then:

x + a = 0 ⇒ x = -a

x + b = 0 ⇒ x = -b

x + c = 0 ⇒ x = -c

Then, the values "a", "b" and "c" are equal to the zeros of the function but with opposite sign. Then, in our case:

a = 1

b = -2

c = -7

Then, the polynomial fuction will be:

(x + 1)(x - 2)(x - 7) = 0

Apply distributive property:

(x² - 2x + x -2)(x -7) = 0

(x² - x - 2)(x - 7)

x³ - x² - 2x - 7x² + 7x + 14 = 0

x³ - 8x² + 5x + 14 = 0

Then, a polynomial function that meets the conditions is:

x³ - 8x² + 5x + 14 = 0

Have a nice day!

6 0
3 years ago
Which of these numbers has the highest value? -22, 0.0099, 0 , -1, &. |-1|
swat32
The highest value is 0.
8 0
4 years ago
Read 2 more answers
Which lines of A, B, and C are perpendicular?
g100num [7]

Answer:

a is perpendicular to both b and c; the product of the slopes a and b or a and c is -1

Step-by-step explanation:

perpendicular slopes multiplied by each other would be -1

-1/3 * 3 for a and both other lines is -1

that means a is perpendicular to both b and c

4 0
3 years ago
Solve the literal equation for yy. 2x−4y=20
Natali5045456 [20]
I believe the answer is y=x/2-5, sorry if im too late
8 0
3 years ago
Work out m and c for the line: y = 9 x − 4
horsena [70]

Answer:

m = 9

c = -4

Step-by-step explanation:

The formula for a line is y = mx+c, where m is the gradient and c is the intercept.

here,

m = 9

c = -4

Hope this helps

good Luck

7 0
3 years ago
Read 2 more answers
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