what happened to the one ? How did 9/5 change?

Question

y+1=-3/5(x-3)

 

y+1=-3/5x+9/5

 

y=-3/5x+4/5

Answer 1

The 1 got subtracted from both sides as 5/5.

 

y + 1 = (-3/5)(x - 3)

y + 1= (-3/5)x + 9/5

 

1 = 5/5 ⇒

y + 5/5 = (-3/5)x + 9/5 

 

y = (-3/5)x + 9/5 - 5/5

 

y = (-3/5)x + 4/5

Answer 2

Distribute the -3/5 to (x - 3).

 

(-3/5)(x - 3) = (-3/5)x + (9/5)