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pav-90 [236]
3 years ago
8

Prove (correctly) that if 1 = -1, then 2=1

Mathematics
1 answer:
Nitella [24]3 years ago
6 0

Answer:

This may not be entirely satisfied proof but you should get the idea.

Proof: Start with 1 = -1.

Then we know that if a= b then a + c = b + c and also a / c = b / c.

So we can add 1 to both sides.

We have 1 + 1 = -1 + 1   ⇒   2 = 0.

Now divide both sides by 2 and we would have 1 = 0.

Now add both sides by 1. This yields 2 = 1.

Therefore if 1 = -1 then 2 = 1.

QED

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5x 2y = 7 y = x 1 What is the solution set of the given system? {(5/7, 12/7)} {(12/7, 5/7)} {(9/7, 16/7)} {(16/7, 9/7)}.
OLEGan [10]

The correct option is A, which is {(5/7, 12/7)}.

<h2>Given to us,</h2>

equation 1, 5x + 2y = 7,

equation 2, y = x+1

To solve the question, as given in equation 2 the value of y which is equal to x+1, Substitute the value of  y in equation 1,

5x + 2y = 7

<h3>substituting,</h3>

5x + 2(x+1) = 7\\5x+2x+2=7\\7x+2=7\\7x=7-2\\7x=5\\\\x= \dfrac{5}{7}

Now, we have the value of x, substitute the value in equation 2, to get y,

y=x+1\\y=(\frac{5}{7})+1\\

Taking LCM,

y=\frac{5+(1\times 7)}{7}  \\y= \dfrac{12}{7}

Hence, the correct option is A, which is {(5/7, 12/7)}.

To know more visit:

brainly.com/question/2263981

4 0
2 years ago
*** 10 points**** if you help me
blsea [12.9K]

Answer:

h squared is 65 but h is 8.06

Step-by-step explanation:

use the pythagorean theorem

7^2+4^2=

49+16= 65

square root of 65 is 8.06

hope this helps

8 0
3 years ago
Please, i need help with this equation
Vaselesa [24]

Answer:

B: 3 IS THE ANSWER

Step-by-step explanation:

3 0
3 years ago
34 is added to x, the result is 98 . What is the value of x? Enter your answer in the box as a fraction in simplest form
KonstantinChe [14]

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