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3 years ago

Urgent!!! Brainliest ,25 points and a thanks for the first to answer.

Mathematics

1 answer:

riadik2000 [5.3K]3 years ago

7 0

Answer:

1) 8

2) 6

3) 7

4) 0

5) 5

6) 1

7) 3

8) 2

9) -14

10) 12

11) -9

12) -6

13) -11

14) 1

15) -6

16) -12

17) -1/2

18) 9/11

19) 7/13

20) 9/7

21) -5/13

22) -13/25

Step-by-step explanation:

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X + y = 30 2x + 4y = 84 Substitution or Elimination I

miv72 [106K]

Answer:

(X,Y)(18,12)

Step-by-step explanation:

x + y = 30

2x + 4y = 84

___________

2x+2y=60

2x+4y=84

_________

-2y=-24/-2y

y=12

2x+4(12)=84

2x+48=84

2x=84-48

2x/2=36/2

X=18

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3 years ago

Y=2x^2 - 10x + 13 Find the value.

pishuonlain [190]

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6 0

3 years ago

How do I solve x^2+11x+28=0

Alex_Xolod [135]

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3 years ago

The number 99 is increased to 104. What is the percentage by which the number was increased, to the nearest tenth of a percent?

Tanya [424]

Answer:

5.1

Step-by-step explanation:

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3 0

3 years ago

Read 2 more answers

Solve | x + 6| - 7 = 8

Alex

Answer:

x = 9,-21

Step-by-step explanation:

Given:

$\displaystyle \large{|x+6|-7=8}$

Transport -7 to add 8:

$\displaystyle \large{|x+6|=8+7}\\\displaystyle \large{|x+6|=15}$

Cancel absolute sign and add plus-minus to 15:

$\displaystyle \large{x+6=\pm 15}$

Transport 6 to subtract ±15:

$\displaystyle \large{x=\pm 15-6}$

Consider:

$\displaystyle \large{x= 15-6}$ or $\displaystyle \large{x = -15-6}$

$\displaystyle \large{x=9}$ or $\displaystyle \large{x=-21}$

Solution:

$\displaystyle \large{x = 9}$ or $\displaystyle \large{x=-21}$

__________________________________________________________

Second Method

Given:

$\displaystyle \large{|x+6|-7=8}$

Transport -7 to add 8:

$\displaystyle \large{|x+6|=8+7}\\\displaystyle \large{|x+6|=15}$

Absolute Function Property:

$\displaystyle \large{|x-a| = \begin{cases} x-a \ \ (x \geq a) \\ -x+a \ \ (x < a) \end{cases}}$

Consider both intervals:

When x ≥ a then:

$\displaystyle \large{|x+6|=15}\\\displaystyle \large{x+6=15}$

Transport 6 to subtract 15:

$\displaystyle \large{x=15-6}\\\displaystyle \large{x=9}$

When x < a then:

$\displaystyle \large{|x+6|=15}\\\displaystyle \large{-(x+6)=15}\\\displaystyle \large{-x-6=15}$

Transport -6 to add 15:

$\displaystyle \large{-x=15+6}\\\displaystyle \large{-x=21}$

Transport negative sign to 21:

$\displaystyle \large{x=-21}$

Solution:

$\displaystyle \large{x=9}$ or $\displaystyle \large{x=-21}$

__________________________________________________________

Let me know if you have any questions regarding this question, my answer or explanation. Hope this answer and explanation helps you and good luck with your assignment!

3 0

2 years ago