Question

Find the slope.

Find the y-intercept
Write the equation (y=mx+b)

At Philip’s Phones you can get a new cell phone plan for $45 a month plus $30 activation fee.

Answer 1

y=45x+30

x=months
y= fee

Answer 2

9514 1404 393

Answer:

• slope: 45
• y-intercept: 30
• equation: y = 45x + 30

Explanation:

The slope is the cost per month. (A slope is often expressed as a ratio: dollars per month, in this case.) The slope is 45.

The y-intercept is the value that obtains when the number of months (in this case) is zero. It is the activation fee, 30. The y-intercept is 30.

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The equation in slope-intercept form is ...

y = mx + b . . . . . where m is the slope and b is the y-intercept

Using the above numbers, the equation is ...

y = 45x + 30