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Zigmanuir [339]
3 years ago
13

A local cell phone company offers two different calling plans. In the first plan, you pay a monthly fee of $30 and $.35 per minu

te. In the second plan, yoy pay a monthly fee of $99 and $.05 per minute. Write a system of equations showing the two calling plans.
Mathematics
1 answer:
Svetach [21]3 years ago
4 0
A local cell phone company offers two different calling plans. In the first plan, you pay a monthly fee of $30 and $.35 per minute. In the second plan you pay a monthly fee of $99 and $.05 per minute. 
<span>a. write a system of equations showing the two calling plans. </span>
<span>scheme 1: monthly charges: 30 + 0.35m .....m = total minutes during the month </span>
<span>scheme 2: monthly charges: 99 + 0.05m </span>

<span>b. when is it better to use the first plan </span>
<span>When you make few calls, only where unavoidable. </span>

<span>c. when is it better to use the second plan. </span>
<span>When you make a lot of call, literally "always on hello!" </span>

<span>d. how much does it cost when the calling plans are equal? 
Question is unclear for me . </span>
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graph A

Step-by-step explanation:

When looking at a graph, there are two different axes. The vertical values--marked by the center up/down line--are "y-values"; and this is called the "y-axis"

The horizontal values--marked by the left/right line--are "x-values"; and this is called the "x-axis"

For the x-axis, values to the left side of the origin (the place where the y-axis and x-axis intercept) are smaller than 0--they are all negative values.

Values to the right side of the origin are positive--greater than 0.

For the y-axis, positive numbers are on the top half [once again, the midpoint / 0 is where the two lines are both = to 0; the origin] and negative numbers are on the bottom half.

Ordered pairs (points) are written as (x,y)

(x-value, y-value)

We are looking for a graph that decreases (along the y-axis), hits a point below the origin, and goes flat/stays constant.

When a graph is decreasing (note: we read graphs from left to right), the line of the graph is slanted downwards (it looks like a line going down).

So, if we look at the graphs, we can see Graph A descending, crossing the y-axis {crossing the middle line /vertical line / y-axis} at a value of -7, and then staying constant (it is no longer increasing or decreasing because the y-values stay the same)

hope this helps!!

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