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olga2289 [7]
4 years ago
6

Help me with this and i'll mark u as the brainest

Mathematics
2 answers:
Leto [7]4 years ago
8 0

I Believe It Is All.

Lesechka [4]4 years ago
5 0

All rational numbers are real numbers.

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Can someone help me with this two problems?
ANEK [815]

2x+4y=0

substitute y with 0

2x+4(0)=0

solve the equation

2x+0=0

2x=0

divide by 2 on both sides

x=0

4x+8y=7

substitute y with 0

4x+8(0)=7

solve the equation

4x+0=7

4x=7

divide by 4 on both sides

x=7/4 or x=1 3/4 or x=1.75

3x-7y=-29

2x+2y=6

solve the bottom equation

3x-7y=-29

x=3-y

substitute for x

3(3-y)-7y=-29

solve the equation

y=19/5

now substitute for y

x=3-\frac{19}{5}

solve for x

x=-4/5

the possible solution of the system is the ordered pair

(x,y)=(-\frac{4}{5} ,\frac{19}{5})

3 0
4 years ago
Can someone try to explain this? I'm super confused. my teacher is no help, he won't answer any of my emails :(​
lukranit [14]

Answer:

m=-1

Step-by-step explanation:

Slope Formula: m=\frac{y_2-y_1}{x_2-x_1}

Simply plug in 2 coordinates into the slope formula to find slope <em>m</em>:

m=\frac{0-(-2)}{-2-0}

m=\frac{0+2}{-2}

m=\frac{2}{-2}

m=-1

5 0
4 years ago
Read 2 more answers
Given sin
Effectus [21]

Answer: \frac{11}{12}

Step-by-step explanation:

<u>Use trigonometry (shown in image below) to find the 3 side-lengths:</u>

  • The side opposite of θ = \sqrt{23}
  • The base side adjacent to θ = 11
  • The hypotenuse = 12

<u>According to right triangle trigonometry:</u>

cos θ = \frac{adjacent}{hypotenuse}

<u>Substitute in the values:</u>

cos θ = \frac{11}{12}

5 0
3 years ago
A chemist needs a 30% iron alloy. How many grams of a 70% iron alloy must be mixed with 16 grams of a 20% iron alloy to obtain t
Alex787 [66]
Let x=grams of 70% alloy:
0.70x+16×0.20=0.30(x+16)
0.70x=0.30x+4.8-3.2
0.40x=1.6
x=1.6/0.4=16/4=4g
4 grams of 70% alloy are needed.
6 0
4 years ago
With explanation pls
olga_2 [115]
Sum of all angles is 360. There are 8 angles. 360/8 is 45. Exterior and interior angles are supplementary meaning their sum is 180. 180-45 is 135.
3 0
3 years ago
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