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nekit [7.7K]
3 years ago
5

Solve the following system of equations by elimination. Express

Mathematics
1 answer:
Greeley [361]3 years ago
4 0
Add the two equations together with the same variables

-x+4x=3x
-3y+3y=0
20+1=21

You now get

3x=21

Divide and find x =7

Plug in x to the equation to find y
Y=-9

(7,-9)
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2 years ago
If n is an integer, which conjecture is not true about 2n– 1? A. 2n– 1 is odd if n is positive. B. 2n– 1 is always even. C. 2n–
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B.



Let's simply look at each conjecture and determine if it's true or false.



A. 2n– 1 is odd if n is positive: Since n is an integer, 2n will always be even. And an even number minus 1 is always odd. Doesn't matter if n is positive or not. So this conjecture is true.



B. 2n– 1 is always even: Once again, 2n will always be even. So 2n-1 will always be odd. This conjecture is false.



C. 2n– 1 is odd if n is even: 2n is always even, so 2n-1 will always be odd, regardless of what n is. So this conjecture is true.



D. 2n– 1 is always odd: 2n will always be even. So 2n-1 will always be odd. Once again, this conjecture is true.



Of the 4 conjectures above, only conjecture B is false. So the answer is B.
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