Change the following linear equations to slope-intercept form y = mx + b. Identify the slope m and y-intercept b

1. 2x + 4y = 8

2. 5y - 30x - 15 = 0

3. x - 3y + 6 = 0

4. 5x - 4 = y

5. 12x + 18 = -3y​