Answer: D
Step-by-step explanation: solve it by substitution
Answer:
1. y = x + 3
2. y =
x -6
3. y = x - 1
4. y = -2x -2
5. y = 2x - 1
6. y =
x - 4
7. y = -x
8. y =
x + 1
Step-by-step explanation:
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Answer:
the secend equation
![y = - x + 9](https://tex.z-dn.net/?f=y%20%3D%20%20-%20x%20%2B%209)
Step-by-step explanation:
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68 - 36 = 32 And if each person bought one box its 32 divided by 3 so your final answer is 10.67
Answer:
is the correct answer.
Step-by-step explanation:
Given:
![$\frac{5}{2+\sqrt{6}}$](https://tex.z-dn.net/?f=%24%5Cfrac%7B5%7D%7B2%2B%5Csqrt%7B6%7D%7D%24)
To find:
if given term is written as following:
![$\frac{A\sqrt{B}+C}{D}$](https://tex.z-dn.net/?f=%24%5Cfrac%7BA%5Csqrt%7BB%7D%2BC%7D%7BD%7D%24)
<u>Solution:</u>
We can see that the resulting expression does not contain anything under
(square root) so we need to rationalize the denominator to remove the square root from denominator.
The rule to rationalize is:
Any term having square root term in the denominator, multiply and divide with the expression by changing the sign of square root term of the denominator.
Applying this rule to rationalize the given expression:
![\dfrac{5}{2+\sqrt{6}} \times \dfrac{2-\sqrt6}{2-\sqrt6}\\\Rightarrow \dfrac{5 \times (2-\sqrt6)}{(2+\sqrt{6}) \times (2-\sqrt6)} \\\Rightarrow \dfrac{10-5\sqrt6}{2^2-(\sqrt6)^2}\ \ \ \ \ (\because \bold{(a+b)(a-b)=a^2-b^2})\\\Rightarrow \dfrac{10-5\sqrt6}{4-6}\\\Rightarrow \dfrac{10-5\sqrt6}{-2}\\\Rightarrow \dfrac{-5\sqrt6+10}{-2}\\\Rightarrow \dfrac{5\sqrt6-10}{2}](https://tex.z-dn.net/?f=%5Cdfrac%7B5%7D%7B2%2B%5Csqrt%7B6%7D%7D%20%5Ctimes%20%5Cdfrac%7B2-%5Csqrt6%7D%7B2-%5Csqrt6%7D%5C%5C%5CRightarrow%20%5Cdfrac%7B5%20%5Ctimes%20%282-%5Csqrt6%29%7D%7B%282%2B%5Csqrt%7B6%7D%29%20%5Ctimes%20%282-%5Csqrt6%29%7D%20%5C%5C%5CRightarrow%20%5Cdfrac%7B10-5%5Csqrt6%7D%7B2%5E2-%28%5Csqrt6%29%5E2%7D%5C%20%5C%20%5C%20%5C%20%5C%20%20%20%28%5Cbecause%20%5Cbold%7B%28a%2Bb%29%28a-b%29%3Da%5E2-b%5E2%7D%29%5C%5C%5CRightarrow%20%5Cdfrac%7B10-5%5Csqrt6%7D%7B4-6%7D%5C%5C%5CRightarrow%20%5Cdfrac%7B10-5%5Csqrt6%7D%7B-2%7D%5C%5C%5CRightarrow%20%5Cdfrac%7B-5%5Csqrt6%2B10%7D%7B-2%7D%5C%5C%5CRightarrow%20%5Cdfrac%7B5%5Csqrt6-10%7D%7B2%7D)
Comparing the above expression with:
![$\frac{A\sqrt{B}+C}{D}$](https://tex.z-dn.net/?f=%24%5Cfrac%7BA%5Csqrt%7BB%7D%2BC%7D%7BD%7D%24)
A = 5, B = 6 (Not divisible by square of any prime)
C = -10
D = 2 (positive)
GCD of A, C and D is 1.
So, ![A +B+C+D = 5+6-10+2 = \bold3](https://tex.z-dn.net/?f=A%20%2BB%2BC%2BD%20%3D%205%2B6-10%2B2%20%3D%20%5Cbold3)