Solve for y
200 + 20y = 400 - 30y
Group our variables 20y and -30y
add 30y to both sides
20y + 200 + 30y = -30y + 400 + 30y
50y + 200 = 400
200y | |
200 |
= |
20 |
200 |
Group our constants 200 and 400.
subtract 200 from both sides
50y + 200 - 200 = 400 - 200
50y = 200
50y | |
50 |
= |
200 |
50 |
y = 4