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zalisa [80]
3 years ago
14

How many solutions does this system have?

Mathematics
2 answers:
Korolek [52]3 years ago
6 0

Answer:

Option- one is correct.

The given system of equations have one solution that is (7,-21)

Step-by-step explanation:

Given system of equations are

y=-3x\hfill (1)

-9x-4y=21\hfill (2)

Now to the solution:

To solve the given system of equations using substitution method.

That is substitute equation(1) in equation (2) we get

-9x-4(-3x)=21 (here y=-3x)

-9x+12x=21

3x=21 (adding the like terms)

x=\frac{21}{3}

Therefore x=7

Now substitute x=7 in equation (1) we get

y=-3x

y=-3(7)

y=-21

Therefore the solution is (7,-21)

Therefore Option- one is correct.

The given system of equations have one solution that is (7,-21)

DedPeter [7]3 years ago
3 0

Answer:

One solution

Step-by-step explanation:

I took the quiz

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SIZIF [17.4K]
C = 4M + 5
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6 0
3 years ago
Which of the following possibilities will NOT form a triangle? (5 points)
ruslelena [56]
<h3>Answer: Choice A</h3>

Side = 5 ft, side = 15 ft, side = 3 ft

Explanation:

The two sides 5 ft and 3 ft add to 5+3 = 8 ft which is not larger than the 15 ft side. This is exactly why a triangle is not possible here.

If we want a triangle to happen, then adding any two sides must be larger than the third side.

If we want a triangle with sides a,b,c, then we need the following to be true

  • a+b > c
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Refer to the triangle inequality theorem for more information.

3 0
2 years ago
Does anyone else agree that the answer for this family of curves question is E, dy/dx = x + y?
neonofarm [45]
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All points along the line x+y = k, for some constant k, will have the same tangent slope k. For example, the line x+y = 0 will have every point with tangent slope 0 for the solution y(x). It may not be 100% clear, but this graph has horizontal tickmarks on the line x+y = 0, or the tickmarks are close to being horizontal. Using geogebra, I checked the others and they produced completely different graphs, which allowed me to rule them out.
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3 years ago
The area of a rectangular
tankabanditka [31]

Answer:

2x+5

Step-by-step explanation:

Okay so lets first factor 2x^2+15x+25

2*25=50

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10*5=15

(x+10/2)(x+5/2)

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3 0
2 years ago
Can someone please help me on this one question?
Katyanochek1 [597]
A+30 = 60
a = 30

a + 2b = 60
30+2b = 60
2b = 30
b = 15

5b - 5c = 60
5(15) - 5c = 60
5c = 15
c = 3

10c + d = 60
10(3) + d = 60
30 + d = 60
d = 30

2d + 6e = 180 - 60
2(30) + 6e = 120
6e = 60
e = 10

4f + 4e = 120
4f + 4(10) = 120
4f = 80
f = 20
5 0
3 years ago
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