Fritz is recording the decay of radioactive material. The table displays the number of weeks and the level of radioactivity he measures each week.
What will be the level of radioactivity in 10 weeks?

isi

step-by-step explanation:

use that smart brain

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

49%

step-by-step explanation:

when you realize that you dont know just realize i just took a test and im so smart