A barnyard is full of chickens and pigs, and the total number of chicken feet and pig feet is $58$.

(a) If there are $c$ chickens and $p$ pigs in the barnyard, write an equation relating the number of chickens and pigs to the total number of feet in the barnyard.

help (equations)

(b) If there are $7$ chickens, how many pigs are there?

Number of pigs = help (numbers)