HELP DO THESE 4 for 100 points and BRAINLIEST asap pls show all your work!
2 answers:
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
(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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please give brainliest
Answer: There are a lot of possibilities
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Answer:
Step-by-step explanation:
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