Sangeetha Pulapaka
0
1. Elena's first mistake was not changing the sign of the constant term when shifting it to the opposite side. The equation 25 x - 20 y = 100, when solved for y would be 25x - 100 = 20 y or y = -5 + \frac{5}{4}x.
2. The equation, y = \frac{5}{4}x -5 is in the slope intercept form y = mx + b where m is the slope and b is the y-intercept. So, the slope is \frac{5}{4} and the y-intercept is -5.