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Sergio039 [100]
2 years ago
12

What do you predict the solution for the system 5x-6y=7 and 6x-7y=8 will be ?​

Mathematics
1 answer:
Alenkinab [10]2 years ago
8 0
System of Linear Equations entered :

[1] 5x - 6y = 7
[2] 6x - 7y = 8
Graphic Representation of the Equations :

-6y + 5x = 7 -7y + 6x = 8

Solve equation [2] for the variable x


[2] 6x = 7y + 8

[2] x = 7y/6 + 4/3
// Plug this in for variable x in equation [1]

[1] 5•(7y/6+4/3) - 6y = 7
[1] - y/6 = 1/3
[1] - y = 2
// Solve equation [1] for the variable y


[1] y = - 2
// By now we know this much :

x = 7y/6+4/3
y = -2
// Use the y value to solve for x

x = (7/6)(-2)+4/3 = -1
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Answer:

A. 27

Step-by-step explanation:

There are 40 students and 90% of them take exams

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Of those 36 students, 75% (or 3/4) of them passed. Assuming passing exams means graduating:

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Svetach [21]

Let

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angle 2=2x°

angle 3=124°

angle 4=124°


we know that

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2x+2x+124+124=360\\ 4x+248=360\\ 4x=112\\ x=28degrees

therefore


the answer is

x=28degrees

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3 years ago
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Aleksandr [31]

Answer:

Denote O as center of circle, draw OA, OC.

As property of tangent line from outside of circle (angle OAD = angle OCD = 90 deg):

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Moreover, angle  AOC = 2 x angle B = 2 x 65 = 130

=> D = 180 - 130 = 50 deg

Hope this helps!

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a_sh-v [17]

Answer: 40

Step-by-step explanation:

Given

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