Answer: x= 5y−60 /4 
Explanation:
Equation: y= 4 /5 x+12 
Step 1: Flip the equation around:
4 /5 x+12=y 
Step 2: Add -12 to both sides of the equation: 
4 /5 x+12+−12=y+−12 
4 /5 x=y−12 
Step 3: Divide both sides of the problem by 4/5: 
4 /5 x/ 4 /5 = y−12 
 4 /5 x= 5y−60/4 
Answer: 
x= 5y−60 /4 .
Hope I could help! :)