5. solution.
Elena wanted to find the slope and y-intercept of the graph of 25x - 20y = 100. She
decided to put the equation in slope-intercept form first. Here is her work:
25x - 20y
20y = 100 - 25x
у
= 5 - 2x
= 100
She concluded that the slope is - and the y-intercept is (0,5).
a.
What was Elena's mistake?
b.
What are the slope and y-intercept of the line? Explain or show your reasoning.