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quester [9]
3 years ago
13

Solve by eliminationx+5y=-13 2x-5y=-20​

Mathematics
2 answers:
juin [17]3 years ago
5 0

Answer:

x+5y=-13 ......(1)

2x-5y=-20..........(2)

adding equation 1 and 2

x+5y+2x-5y=-13-20

3x=-33

x=-33/3=-11....answer

multiplying equation 1 by 2 and adding equation 1&2

2x+10y-2x-(-5y)=-26-(-20)

10y+5y=-26+20

15y=-6

y=-6/15=-2/5......answer

jekas [21]3 years ago
3 0

Answer: x+5y=-13= (x=−5y−13)

   2x-5y=-20​= <u>(x=5/2y-10)        </u>

Step-by-step explanation: The answers are labeled in parenthesis. According to my calculations, this is what I got. Sorry for any inconvenience.

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Pls help ASAP!! Find the missing side using the rules for 45-45-90 and 30-60-90 right triangles
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4 0
3 years ago
PLZ NEED AN ANSWER FAST WORTH 5 TO 10 POINTS
worty [1.4K]

n - 12 = -9

Add 12 to both sides to isolate the variable n.

n = -9 + 12

n = 3

B) n = 3

4 0
4 years ago
What is the slope of a line that goes through the points 1,-5 and -3,2? I'm helping my niece
a_sh-v [17]
M = (y2 - y1)/(x2-x1)
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4 0
3 years ago
Find the volume of each figure
konstantin123 [22]

Answer:

<u>1) 17.5×14×64</u>

  • → 1568 in³

<u>2) volume= 0.5×3.6×10×5=</u>

  • → 90

<u>3) d= 13, r=13/2= 6.5, h= 19</u>

  • → v= πr²h
  • → π(6.5)²×19
  • → 2521.91 mm³

<u>4) Base Area= a+b/2×h</u>

  • → (37+15)/2×25.7 cm²
  • →26×25.7 cm²
  • → 668.2 cm²
  • height= 20cm
  • voulme = 668.2×20
  • → 13364 cm²

<u>5) L×W×H</u>

  • → 25×7×18
  • → 175×18
  • → 3150 ft³

<u>6) v=πr²h</u>

  • → π(3.2²)(8)
  • → 81.92π
  • → 257.36 km²

------------

hope it helps...

have a great day!!

6 0
3 years ago
Read 2 more answers
Match the circle equations in general form with their corresponding equations in standard form. x2 + y2 − 4x + 12y − 20 = 0 (x −
Lemur [1.5K]
The equation form of a circle is (x - a)² + (y - b)² = r²

Equation 1:

x² - 4x + y² + 12y - 20 = 0 ⇒ use the completing the square method for x² - 4x and y² + 12y

x² - 4x = (x - 2)² - 4
y² + 12y = (y + 6)² - 36

Put them back together, we have
(x - 2)² - 4 + (y + 6)² - 36 - 20 = 0
(x - 2)² + (y + 6)² -4 - 36 - 20 = 0
(x - 2)² + (y + 6)² - 60 = 0
(x - 2)² + (y + 6)² = 60

Equation 2:

x² + y² + 6x - 8y - 10 = 0
(x² + 6x) + (y² - 8y) -10 = 0
(x + 3)² - 9 + (y - 4)² -16 - 10 = 0
(x + 3)² + (y - 4)² - 9 - 16 - 10 = 0
(x + 3)² + (y - 4)² - 35 = 0
(x + 3)² + (y - 4)² = 35

Equation 3:

3x² + 12x + 3y² +18y - 15 = 0
3 [x² + 4x + y² + 6y - 5] = 0
x² + 4x + y² + 6y - 5 = 0
(x² + 4x) + (y² + 6y) - 5 = 0
(x + 2)² - 4 + (y + 3)² - 9 - 5 = 0
(x + 2)² + (y + 3)² - 4 - 9 -5 = 0
(x + 2)² + (y + 3)² - 18 = 0
(x + 2)² + (y + 3)² = 18

Equation 4:

5x² + 5y² - 10x + 20y - 30 = 0
5 [x² + y² - 2x + 4y - 6] = 0
x² + y² - 2x + 4y - 6 = 0
(x² - 2x) + (y² + 4y) - 6 = 0
(x - 1)² - 2 + (y + 2)² - 4 - 6 =0
(x - 1)² + (y + 2)² - 2 - 4 - 6 = 0
(x - 1)² + (y + 2)² - 12 = 0
(x - 1)² + (y + 2)² = 12

Equation 5:

2x² + 2y² - 24x - 16y -8 = 0
2 [x² + y² - 12x - 8y - 4] = 0
x² + y² - 12x - 8y - 4 = 0
(x² - 12x) + (y² - 8y) - 4 = 0
(x - 6)² - 36 + (y - 4)² - 16 - 4 = 0
(x - 6)² + (y - 4)² -36 - 16 - 4 = 0
(x - 6)² + (y - 4)² - 56 = 0
(x - 6)² + (y - 4)² = 56

Equation 6:

x² + y² + 2x - 12y - 9 = 0
(x² + 2x) + (y² - 12y) - 9 = 0
(x + 1)² - 1 + (y - 6)² - 36 - 9 = 0
(x + 1)² + (y - 6)² - 1 - 36 - 9 = 0
(x + 1)² + (y - 6)² - 46 = 0
(x + 1)² + (y - 6)² = 46


3 0
3 years ago
Read 2 more answers
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