19) 5c+c=-6+2
6c=-4
c=-4/6
c=-2/3
20) -20-8=-2e
-28=-2e
28/2=e
14=e
21)p-2w=2l
(p-2w)/2=l
Answer:
(6,0)
Step-by-step explanation:
The given system has equations:
![x-4y=6](https://tex.z-dn.net/?f=x-4y%3D6)
![2x+2y=12](https://tex.z-dn.net/?f=2x%2B2y%3D12)
Multiply the top equation by 2 to get:
![2x-8y=12](https://tex.z-dn.net/?f=2x-8y%3D12)
![2x+2y=12](https://tex.z-dn.net/?f=2x%2B2y%3D12)
Subtract the top equation form the bottom equation to get:
![2x-2x+2y--8y=12-12](https://tex.z-dn.net/?f=2x-2x%2B2y--8y%3D12-12)
![\implies 10y=0](https://tex.z-dn.net/?f=%5Cimplies%2010y%3D0)
![\implies y=0](https://tex.z-dn.net/?f=%5Cimplies%20y%3D0)
Put y=0 into ![x-4y=6](https://tex.z-dn.net/?f=x-4y%3D6)
![x-4*0=6](https://tex.z-dn.net/?f=x-4%2A0%3D6)
![\implies x=6](https://tex.z-dn.net/?f=%5Cimplies%20x%3D6)
Therefore the solution is (6,0)
Answer:
a=2 and b=2...............
The answer is 14.27 :) correct me if wrong I think I am