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grigory [225]
3 years ago
8

In an indirect proof, it is essential to reach a _____of a known fact.

Mathematics
2 answers:
Sonbull [250]3 years ago
8 0

Answer: 2. conclusion

alexandr402 [8]3 years ago
4 0

Answer: 3. contradiction

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Prove that the lines x+y=5, 2x–y=16 and x+2y=3 intersect at one point. What are the coordinates of this point?
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Answer:

The coordinates of the intersection point are (7,-2)

Step-by-step explanation:

we have

x+y=5 -----> equation A

2x-y=16 -----> equation B

x+2y=3 -----> equation C    

we know that

If the system of equations intersect at one point, then the system of equations has one solution

using a graphing tool

see the attached figure

The coordinates of the intersection point are (7,-2)

This point is a common solution for the three equations

Verify

Substitute the value of x=7, y=-2 in each equation

so

Equation A

x+y=5

7-2=5

5=5 ----> is true, therefore the point is a solution of the equation A

Equation B

2x-y=16

2(7)+2=16

16=16 ----> is true, therefore the point is a solution of the equation B

Equation C

x+2y=3

7+2(-2)=3

3=3 ----> is true, therefore the point is a solution of the equation C

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2 years ago
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