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g100num [7]
3 years ago
11

Determine if the solution set for the system of equations shown is the empty set, contains one point or is infinite. 5x+7=2y and

y-9x=23
A) {}
B) 1 solution
C) Infinite
Mathematics
2 answers:
Luda [366]3 years ago
7 0

Answer:

The correct option is option B. It has one solution, and it's x=-3

Step-by-step explanation:

We have the following system of equations:

5x+7 = 2y                        (1)

y-9x=23                            (2)

Step 1: Solve for 'y' in equation (2):

y-9x = 23

y = 9x + 23

Step 2: Substitute in equation (1):

5x + 7 = 2y

5x + 7 = 2(9x + 23)

5x + 7 = 18x + 46

Step 3: Solve for x:

7 - 46 = 18x - 5x

-39 = 13x

x= -3

So the correct option is option B. It has one solution, and it's x=-3

jeka57 [31]3 years ago
7 0

Answer: Option B

The system has 1 solution

Step-by-step explanation:

We must solve the following system of equations

5x+7=2y\\\\y-9x=23  

To solve it, clear y from the second equation and then substitute in the first equation

y=23 + 9x

Now substitute in the first equation

5x+7=2(23 + 9x)\\\\5x +7 = 46 + 18x\\\\5x -18x = 46-7\\\\-13x = 39\\\\x = -\frac{39}{13}\\\\x=-3

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swat32

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Step-by-step explanation:

It's like saying.. Someone had won 4 races every 12 race

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7 0
3 years ago
Consider angle θ in Quadrant II, where sinθ = 4/5 . What is the value of cosθ?
Kay [80]

Answer:

3/5

Step-by-step explanation:

sin theta=opposite/hypotenuse

4/5=opposite/hypotenuse

therefore opposite=4 and hypotenuse=5

for adjacent

using pythagoras theorem

a^2+b^2=c^2

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adjacent^2 =25-16

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cos theta=adjacent/hypotenuse

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8 0
3 years ago
MAX POINTS!!!! Please help me solve the problem in the picture and tell me what I’m doing also explain each step.
lapo4ka [179]

Answer: j=0.4

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-0.1j+0.8=0.76

-0.1+0.8-0.8=0.76-0.8

-0.1j=-0.04

-0.1j/-0.1=-0.04/-0.1

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Ya have a good day.

5 0
3 years ago
Read 2 more answers
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