haley816
30.07.2019 •
Mathematics
Match each as a compound (c) or element (e) cu hci cci4 co hi ch4
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Ответ:
HCI compound?
CCI4 compound
Co compound ?
HI compound
CH4 compound
Ответ:
The student went from x+y = 2 to 2x+2y = 2, which is not correct. They multiplied the left side by 2, but forgot about the right hand side.
They should have gone from x+y = 2 to 2x+2y = 4 after multiplying both sides by 2.
So they should have this new equivalent system
Add straight down and we end up with the new equation 5x = 12 which solves to x = 12/5 = 2.4
Use that x value to solve for y. You should get y = -2/5 = -0.4