Question

Im stuck i need help on this

Answer 1

(a.) Elena divided by 20 instead of negative 20

(b). y = 5/4x - 5

Explanation:

We can find Elena's mistake by putting the equation in slope-intercept forms and comparing it to Elena's process:

`25x-20y=100\\-20y=100-25x\\y=-5+5/4x`

Once you subtract 25x from both sides, it leaves you with -20y on the right side. Thus, Elena changed -20 into 20 and divided by it instead of -20.