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To find the rate of change, we can use the formula: rate of change = (change in y) / (change in x).
In this case, the change in y is 70 - 80 = -10. The change in x is -1 - (-2) = 1.
So, the rate of change = (-10) / (1) = -10.
The y-intercept is the value of y when x = 0. In this case, when x = 0, y = 80.
So, the y-intercept = 80.
The equation of the line can be written as y = mx + b, where m is the slope (rate of change) and b is the y-intercept.
Substituting the values we found, the equation of the line is: y = -10x + 80.