Answer:
![x = 4](https://tex.z-dn.net/?f=x%20%3D%204)
![y = -5](https://tex.z-dn.net/?f=y%20%3D%20-5)
Step-by-step explanation:
Given
![-10x^2+80x+y=155](https://tex.z-dn.net/?f=-10x%5E2%2B80x%2By%3D155)
![5x^2-40x+y=-85](https://tex.z-dn.net/?f=5x%5E2-40x%2By%3D-85)
Required
Solve by substitution
Make y the subject in ![5x^2-40x+y=-85](https://tex.z-dn.net/?f=5x%5E2-40x%2By%3D-85)
![5x^2-40x+y=-85](https://tex.z-dn.net/?f=5x%5E2-40x%2By%3D-85)
![y = -5x^2 + 40x - 85](https://tex.z-dn.net/?f=y%20%3D%20-5x%5E2%20%2B%2040x%20-%2085)
Substitute
in the first equation
![-10x^2+80x+y=155](https://tex.z-dn.net/?f=-10x%5E2%2B80x%2By%3D155)
![-10x^2 + 80x -5x^2 + 40x - 85 = 155](https://tex.z-dn.net/?f=-10x%5E2%20%2B%2080x%20-5x%5E2%20%2B%2040x%20-%2085%20%3D%20155)
Collect Like Terms
![-5x^2-10x^2 + 80x + 40x - 85 - 155=0](https://tex.z-dn.net/?f=-5x%5E2-10x%5E2%20%2B%2080x%20%20%2B%2040x%20-%2085%20-%20155%3D0)
![-15x^2 + 120x-240=0](https://tex.z-dn.net/?f=-15x%5E2%20%2B%20120x-240%3D0)
Divide through by -15
![x^2 -8x + 16 = 0](https://tex.z-dn.net/?f=x%5E2%20-8x%20%2B%2016%20%3D%200)
![x^2 - 4x - 4x + 16 = 0](https://tex.z-dn.net/?f=x%5E2%20-%204x%20-%204x%20%2B%2016%20%3D%200)
![x(x - 4) - 4(x - 4) = 0](https://tex.z-dn.net/?f=x%28x%20-%204%29%20-%204%28x%20-%204%29%20%3D%200)
![(x - 4)(x - 4) = 0](https://tex.z-dn.net/?f=%28x%20-%204%29%28x%20-%204%29%20%3D%200)
or ![x - 4\ = 0](https://tex.z-dn.net/?f=x%20-%204%5C%20%3D%200)
or ![x = 4](https://tex.z-dn.net/?f=x%20%3D%204)
![x = 4](https://tex.z-dn.net/?f=x%20%3D%204)
Substitute 4 for x in ![y = -5x^2 + 40x - 85](https://tex.z-dn.net/?f=y%20%3D%20-5x%5E2%20%2B%2040x%20-%2085)
![y = -5(4)^2 + 40 * 4 - 85](https://tex.z-dn.net/?f=y%20%3D%20-5%284%29%5E2%20%2B%2040%20%2A%204%20-%2085)
![y = -5*16 + 40 * 4 - 85](https://tex.z-dn.net/?f=y%20%3D%20-5%2A16%20%2B%2040%20%2A%204%20-%2085)
![y = -80 + 160 - 85](https://tex.z-dn.net/?f=y%20%3D%20-80%20%2B%20160%20-%2085)
![y = -5](https://tex.z-dn.net/?f=y%20%3D%20-5)
Yes i belive the bottom one is that a G or a c or Q if its G yes you are right no lie
Answer:
No, because 4 is repeated in the domain.
Step-by-step explanation:
Answer:
Step-by-step explanation:
113.1 or D would be the correct answer out of the following choices
Answer:
French: la somme d'un nombre inconnu et 12
Spanish: la suma de un número desconocido y 12
Latin: XII numerus ignotus est et summa
Step-by-step explanation: