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hodyreva [135]
4 years ago
11

Eighth grade AA.8 Solve a system of equations using substitution clouds Solve using substitution. 4x + 7y = 9 y = 3 ( , ) Submit

Mathematics
1 answer:
lana [24]4 years ago
7 0

Answer:  (-3, 3)

<u>Step-by-step explanation:</u>

4x + 7y = 9

y = 3


Replace "y" with "3" in the first equation to solve for x:

4x + 7(3) = 9

4x + 21 = 9

4x         = -12       <em>subtracted 21 from both sides</em>

 x         = -3          <em>divided both sides by 4</em>


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Need answers ASAP if you can help! Please and Thankyou
Nezavi [6.7K]

Answer:

X = 78, Z = 29, and Y = 102

Step-by-step explanation:

X = 78. 43 + 59 = 102. There has to be 180 degrees in a triangle. So subtract 180 by 102.

Z = 29. Think of the whole triangle for this one. 43 + 49 + 59 = 151. 180 - 151 = 29.

Y = 102. Plug in the value of Z. 49 + 29 = 78. 180 - 78 = 102.

Hope that helps!

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3 years ago
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masya89 [10]

Answer:

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3 years ago
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Anna71 [15]

Answer:

answer a

Step-by-step explanation:

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3 years ago
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vfiekz [6]

Answer:

D

Step-by-step explanation:

A is not true because from the graph, they make less money at $13 compared to $10 even though 13 > 10. B isn't true either because when the app price is more than $7 the profit <em>decreases, </em>not increases. D is true because the y-coordinate of the vertex (which is the maximum in this case) is about 40 million, and if we know the maximum already we know that C is false because 40 ≠ 7.

6 0
3 years ago
LK is tangent to circle J at point K. Circle J is shown. Line segment J K is a radius. Line segment K L is a tangent that inters
Evgen [1.6K]

Answer:

(B)r=\dfrac{85}{12}

Step-by-step explanation:

Given a circle centre J

Let the radius of the circle =r

LK is tangent to circle J at point K

From the diagram attached

  • LX=6
  • Radius, XJ=JK=r
  • LK=11

Theorem: The angle between a tangent and a radius is 90 degrees.

By the theorem above, Triangle JLK forms a right triangle with LJ as the hypotenuse.

Using Pythagoras Theorem:

(6+r)^2=r^2+11^2\\(6+r)(6+r)=r^2+121\\36+6r+6r+r^2=r^2+121\\12r=121-36\\12r=85\\r=\dfrac{85}{12}

The length of the radius, r=\dfrac{85}{12}

8 0
4 years ago
Read 2 more answers
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