Solve 3y − 7 = y + 5 and explain each step so i understand

What you must do for this case is the clearance of the unknown y.
 We have then:
 Step 1:
 (3y - 7) - y = (y + 5) - y
 Step 2:
 2y-7 = 5
 Step 3:
 (2y-7) + 7 = (5) +7
 Step 4: 
 2y = 12
 Step 5:
 y = 12/2
 y = 6
 
 y = 6

It has a slope of 1 nd a y intercept of -2