Answer:
![\displaystyle [-2, 7]](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5B-2%2C%207%5D)
Step-by-step explanation:
You want to eradicate one pair of variables so they are set to zero. It does not matter which pair is selected:
![\displaystyle \left \{ {{4x + 2y = 6} \atop {-2x + 2y = 18}} \right.](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cleft%20%5C%7B%20%7B%7B4x%20%2B%202y%20%3D%206%7D%20%5Catop%20%7B-2x%20%2B%202y%20%3D%2018%7D%7D%20%5Cright.)
{½[4x + 2y = 6]
{−2x + 2y = 18
>> ![\displaystyle \left \{ {{2x + y = 3} \atop {-2x + 2y = 18}} \right. \\ \\ \frac{3y}{3} = \frac{21}{3} \\ \\ \\ y = 7](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Cleft%20%5C%7B%20%7B%7B2x%20%2B%20y%20%3D%203%7D%20%5Catop%20%7B-2x%20%2B%202y%20%3D%2018%7D%7D%20%5Cright.%20%5C%5C%20%5C%5C%20%5Cfrac%7B3y%7D%7B3%7D%20%3D%20%5Cfrac%7B21%7D%7B3%7D%20%5C%5C%20%5C%5C%20%5C%5C%20y%20%3D%207)
Plug this back into the system to get the x-value of ![\displaystyle -2.](https://tex.z-dn.net/?f=%5Cdisplaystyle%20-2.)
I am joyous to assist you at any time.
Answer:
I dont know wow this is hard i think it is 151 but im not sure
Step-by-step explanation:
-2/3 - 5/6
We need common denominators so, since 3 can go into 6, we only need to multiply the first fraction by 2.
= -2 x 2 / 3x2 - 5/6
= -4 / 6 - 5/6
We only subtract the numbers that are in the numerators,
= -4-5 / 6
= -9/6
Both nine and six are divisible by 3, so to put into lowest terms...
=-9÷3 / 6÷3
= -3/2 <--- Final Answer
The explicit formula for the sequence is -5n + 12