Calculate the slope of each line. Write your answer in simplest form,
2 answers:
Answer:
-5/2
2/3
0
Step-by-step explanation:
Make a triangle with two points on the line.
Count the squares to get rise (change in y) and run (change in x).
Slope=rise/run
For (3), pick two easy points on the line. For example, (-1,2) and (-3,7).
Slope=(y1-y2)/(x1-x2)
Point1 = (-1,2): y1=2 and x1=-1
Point2=(-3,-7)): y2=7 and x2=-3
Slope=
=-5/2
Same process for others. Slope is about incline (think driving up a hill), so for (5) the slope is 0 because the line is horizontal.
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We have been given that last month Maria purchased a new cell phone for $500. The store manager told her that her cell phone would depreciate by 70% every 6 months.
We know that an exponential function is in form , where,
y = Final value,
a = Initial value,
r = Decay rate in decimal form,
x = Time in years.
Let us convert into decimal form.
Initial value of car is 500, so .
Since value of phone depreciates every months, so value of phone will depreciate twice in a year.
Upon substituting our given values in exponential decay function, we will get:
To find the value of phone after 2 years, we will substitute in our equation.
Therefore, option D is the correct choice.
Let us simplify our equation.
Therefore, option B is correct as well.