Answer:
x=8
Step-by-step explanation:
isn't that the same question
Answer:
x=2, y=7 (2,7)
Explanation:
Solve for the first variable in one of the equations, then substitute the result into the other equation.
The required expression is 100 - 0.2w
Step-by-step explanation:
Given,
Amount of radioactive substance = 100 mg
The substance decreases by 20% each week.
To find the remaining amount of the in w weeks.
Now,
Each week 20% = 0.2 of the substance will be decreased.
So, in w weeks 0.2×w of the the substance will be decreased.
Hence,
The remaining substance = 100 - 0.2w
As you can see, this is a negative slope. It goes down three and over four, as seen on the x and y intercepts. The answer kind of pops out at you.
Answer: x equals 4 your welcome
