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AlladinOne [14]
2 years ago
13

SOLVE ALL THESE EQUATION BY USING THE METHOD SUBSTITUTION ALGEBRAICALLY HERE'S ARE ALL THE EQUATION:

Mathematics
1 answer:
pav-90 [236]2 years ago
3 0

Answer:

See below ~

Step-by-step explanation:

<u>Question 1</u>

  • -7x - y = -1
  • y = 8x + 16

⇒ -7x - (8x + 16) = -1

⇒ -7x - 8x - 16 = -1

⇒ -15x = 15

⇒ x = -1

⇒ y = 8(-1) + 16 = 8

⇒ Solution = <u>(-1, 8)</u>

<u></u>

<u>Question 2</u>

  • 3x + 4y = 0
  • y = -3x - 18

⇒ 3x + 4(-3x - 18) = 0

⇒ 3x - 12x - 72 = 0

⇒ -9x = 72

⇒ x = -8

⇒ y = -3(-8) - 18 = 6

⇒ Solution = <u>(-8, 6)</u>

<u>Question 3</u> (not clear)

<u>Question 4</u>

  • -8x - 7y = 0
  • y = 6x

⇒ -8x - 7(6x) = 0

⇒ -8x - 42x = 0

⇒ -50x = 0

⇒ x = 0

⇒ y = 6(0) = 0

⇒ Solution = <u>(0, 0)</u>

<u>Question 8</u>

  • 2x - 6y = -14
  • y = -5x - 19

⇒ 2x - 6(-5x - 19) = -14

⇒ 2x + 30x + 114 = -14

⇒ 32x = -128

⇒ x = -4

⇒ y = -5(-4) - 19 = 1

⇒ Solution = <u>(-4, 1)</u>

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2 years ago
1).<br>A) supplementary<br>B) complementary<br>C) comesponding<br>D) alternate interior​
zlopas [31]
If you are trying to find the bigger angle, then the answer is A) Supplementary. But if you’re trying to find the small angle the answer is B) Complementary. C and D are both wrong.
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3 years ago
Segment CD has endpoints (-4, 3) and (8, -1). Find the coordinates of the point that divides the line segment directed from C to
Diano4ka-milaya [45]

Answer:

A(0.8,\ 1.4)\ \text{or }\ A\left(\dfrac{4}{5},\dfrac{7}{5}\right)

Step-by-step explanation:

If point A(x,y) divides the segment with endpoints  C(x_1,y_1) and D(x_2,y_2) in the ratio m:n,

then

x=\dfrac{nx_1+mx_2}{m+n}\\ \\y=\dfrac{ny_1+my_2}{m+n}

In your case,

C(-4,3)\\ \\D(8,-1)\\ \\m:n=2:3

then

x=\dfrac{3\cdot (-4)+2\cdot 8}{2+3}=\dfrac{-12+16}{5}=\dfrac{4}{5}=0.8\\ \\y=\dfrac{3\cdot 3+2\cdot (-1)}{2+3}=\dfrac{9-2}{5}=\dfrac{7}{5}=1.4

Thus,

A(0.8,\ 1.4)\ \text{or }\ A\left(\dfrac{4}{5},\dfrac{7}{5}\right)

3 0
3 years ago
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Ipatiy [6.2K]

Answer:

11.

Step-by-step explanation:

The scores 60-69 has two people. The scores 70-79 have 9 people. Both are lower or below 80.

6 0
3 years ago
Read 2 more answers
Jesus earned 50 points in a video game. He lost 40 points, earned 87 points, then lost 30 more points. Write and evaluate an exp
Lana71 [14]

The final score in the video game is 67.

Step-by-step explanation:

Points earned = 50 points, 87 points

Points lost = 40 points, 30 points

Let,

Plus sign (+) represent the points earned.

Negative sign (-) represent the points lost.

Therefore,

Points earned = +50, +70

Points lost = -40, -30

Adding all the points to get final score;

Final score = 50+(-40)+87+(-30)

Final\ score=50-40+87-30\\Final\ score = 137-70\\Final\ score=67

The final score in the video game is 67.

Keywords: integers, subtraction

Learn more about subtraction at:

  • brainly.com/question/1836777
  • brainly.com/question/2115122

#LearnwithBrainly

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