Answer:
Part 1)

Part 2)
Part 3)

Explanation:
we know that
The equation of the line into slope intercept form is equal to

where
m is the slope
b is the y-coordinate of the y-intercept
Part 1) we have

Simplify
Divide by 20 both sides

isolate the variable y
Subtract x both sides

Divide by 4 both sides
------> equation of the line into slope intercept form
Part 2) we have

Simplify
Divide by 10 both sides

isolate the variable y
Subtract (3x-10) both sides

Divide by 5 both sides
------> equation of the line into slope intercept form
Part 3) we have

Simplify
Divide by 3 both sides

isolate the variable y
Subtract (x-10) both sides

Divide by -5 both sides
------> equation of the line into slope intercept form