Question

Write an equation for the data in the table. Identify your variables.

Answer 1

First find the slope m. slope formula:
`(y_(2) - y_(1) )/(x_(2) - x_(1) )`

Let's use (0, -20) for x1 and y1; and (2, 10) for x2 and y2

`(10-(-20))/(2-0)` =
`(30)/(2)` =
`15`

Now find the y-intercept: the point where the graph crosses the y-axis. The y intercept always has an x value of 0. So -20 is the y-intercept

Use the slope formula
`y = mx + b`. Slope=m, y-intercept = b

y = 15x - 20

y is the money in the bank account in dollars

x is the day