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xxMikexx [17]
3 years ago
11

When Arianna, left her house, her cell phone was 45% charged started losing charge at a constant rate. 4 hours after leaving her

house, the battery had 15% remaining battery life. Write an equation for
B
,
B, in terms of
t
,
t, representing the charge remaining in Arianna's battery, as a percentage,
t
t hours after Arianna left her house.
Mathematics
1 answer:
Setler [38]3 years ago
6 0

Answer:

ur answer would be B, because you do 45-15 x 4

Step-by-step explanation:

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Answer:  The steps and answers to the first two are below but you need to understand slope  = change in y / change in x  = y2 - y1/ x2 - x1  

And you need to understand  y = mx + c  

m= slope   c is y intercept

Substitute either point given  - only use one as the x and y  and find c

Step-by-step explanation:

1.      You need to follow the steps -

          the point is given as  (2,5)  = (x,y)  

So what this means is  x =2 and y =5

Simple substitutions is the step  5   = 3 x 2 + c

                                                     5 = 6 + c  or easier to see is  c + 6 =5

subtract 6 from both sides   c +  6   =  5

                                                    -6      -6

                                           __________________

                                              c           =  -1

2.

 x1,y1           x2,y2

( 3,2)   and (5,6) are two points on the line  

you already calculate the slope which is   m = noy2-y1/x2-x1 = 6-2/5-3 = 4/2 = 2

Remember y= mx + c

                   y = 2 x + c

now substitute in (3,2) which is (x1, y1) into the x and y in your equation

                  2  = 2 (3)  + c

                  2 = 6 + c

 subtract 6 from both sides

                  -4 = c

Now you should use this and do your last question  yourself

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Step-by-step explanation:

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