Mia’s work to find the slope of a trend line through the points (3, 10) and (35, 91) is shown below. mia’s work step 1: 3-35/10-91 step 2: -32/-81 step 3: 32/81 what was the first error that mia made? a: mia simplified incorrectly and made the slope positive. b: mia subtracted in the wrong order. c: mia switched the numerator and the denominator. d: mia used subtraction instead of addition.