Equation (1)

Equation (2)

Get y alone in equation (1)

Insert y in equation (2)

Answer:
2(7x-4)
Step-by-step explanation:
<h2>Please write ur question properly</h2>
for a all you have to do is * you will find the answer. for b what ever yo answer was for a u will put that for the hours n what u had * u put for min for seconds