Question 60149
Jasmine has a cell phone service for which she pays $10 a month plus $0.05 per minute. 
This is called a linear equation because the phone bill raises in a straight line depending upon the number of minutes used.
y=mx+b [Use the slope-intercept form of the equation of a line]
y=any y-value on this line
m=the slope of the line
x=the corresponding x-value on this line
b=the point where the line crosses the y-axis.  Also called the y-intercept 
.
Re-interpreting the question:
y= any y value on this line (value not given)
m=$0.05 for every minute used.
x= any corresponding x-value on this line (value not given)
b=the flat fee that occurs each and every month regardless of the number of minutes used (this the y-intercept
 
.
So, the equation of this line is:
y= 0.05x+10 [Plug-in the values]

.
2. Graph the relationship between the number of minutes and the cost of using the cell phone service

. {{{ graph( 300, 200, -6, 5, -10, 10,  0.05x+10 ) }}} 
3. Explain how the slope and the y-intercept relate to the situation. 
The slope indicates that for every minute used, the bill increases by 0.05cents.  The y-intercept indicates that the bill has a flat fee of $10.00 per month regardless of how many minutes are used.
Note:  Try plugging-in different values for x (minutes) and solve the equation.  You will see that as the x's increase, so does the phone bill. At x=0 (no phone calls), the bill is $10.00