What is the solution to the following system? 5x+2y+z=4 x+2z=4 2x+y-z=-1 a. x = 0, y = 1, z = 2 b. x = 1, y = –1, z = 2 c. x = 1, y = 0, z = –1 d. x = 2, y = 1, z = 0

correct choice is A

Step-by-step explanation:

From the second equation express x and substitute it into the first and third equations:

Then

From the third equation and substituting it into the second, you get

If then

and

The solution of the system is

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value