The formula for finding slope is y₁ - y₂ / x₁ - x₂, where y₁, y₂, x₁, and x₂ are coordinates of two given points, (x, y).
Hannah's error is that she placed the x-values in the numerator of the formula; the y-values go in the numerator, as shown above.
The correct substitution would be as follows.
165 - 90 / 11 - 6
To simplify this, subtract the numbers in the numerator and the denominator, and then divide.
165 - 90 / 11 - 6
75 / 5
15
Answer:
slope = 15