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alukav5142 [94]
2 years ago
7

HELP DO THESE 4 for 100 points and BRAINLIEST asap pls show all your work!

Mathematics
2 answers:
mina [271]2 years ago
7 0

Answer:

  • 10) (- 7, - 1)  11) (-3, - 1)  14) (9, 5)  15) (1, - 2)

Step-by-step explanation:

<h3>#10</h3>
  • x = - 7
  • 3x - 5y = - 16 ⇒ 3(- 7) - 5y = - 16 ⇒ - 21 - 5y = - 16 ⇒ 5y = - 5 ⇒ y = - 1
<h3>#11</h3>
  • - 8x + y = 23  (x4) ⇒ - 32x + 4y = 92
  • - x - 4y = 7

<u>Add up:</u>

  • - 32x - x = 92 + 7 ⇒ - 33x = 99 ⇒ x = - 3

<u>Find y:</u>

  • - (- 3) - 4y = 7 ⇒ 3 - 4y = 7 ⇒ 4y = - 4 ⇒ y = - 1
<h3>#14</h3>
  • x = 9
  • y = 1/3x + 2 ⇒ y = 1/3(9) + 2 ⇒ y = 3 + 2 ⇒ y =  5
<h3>#15</h3>
  • - 2x - 3y = 4  (x 2)  ⇒ - 4x - 6y = 8
  • - 7x + 2y = - 11  (x 3) ⇒ - 21x + 6y = - 33

<u>Add up:</u>

  • - 4x - 21x = 8 - 33 ⇒ - 25x = - 25 ⇒ x = 1

<u>Find y:</u>

  • (-2)(1) - 3y = 4 ⇒ - 2 - 3y = 4 ⇒ - 3y = 4 + 2 ⇒ - 3y = 6 ⇒ y = - 2

Mnenie [13.5K]2 years ago
6 0

(10)x= -7_______(i)

3x-5y= -16____(ii)

put value of x in (ii) then we have:-

3x-5y= -16

3(-7)-5y= -16

-21-5y= -16

-5y = -16+21

-5y = 5

y = 5/-5= -1

y= -1

(11)

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