I line that is perpendicular is a line with reversed slopes like 2/1 is perpendicular to -1/2. So find the slope by getting the y by itself and reverse it. Remember to switch the signs too! P.S. if you don't know how to get the y by itself just take and subtract 3x from -5y and -4 then divide by 5. Hope I helped!
Answer:
3:2
Step-by-step explanation:
girls: boys
18 : 12
Divide each side by 6
18/6 : 12/6
3 : 2