Question

The table shown compares the number of months since a savings account was opened (x) to the monthly balance in dollars (y).
Number of Months Balance (dollars)
1 $400
5 $800
7 $1,000
10 $1,300
Calculate the slope of the line that passes through these ordered pairs.

100

1 over 100

80

1 over 80

Answer 1

Slope = (change in y) / (change in x). Using (1, 400) and (5, 800): (800−400)/(5−1) = 400/4 = 100. So the slope is 100.