need this put into equation form
Sue Ellen and Angela have both saved $51 for theirfamily trip to the coast. They each put money in their piggy bank onthe same day but Sue Ellen started with $7 more than Angela. Fromthere on Sue Ellen added $1 to her piggy bank each week and Angelaput $2 in her piggy bank each week. How much money did Sue Ellen putin her piggy bank when they started?
Sue Ellen and Angela have both saved $51 for theirfamily trip to the coast. They each put money in their piggy bank onthe same day but Sue Ellen started with $7 more than Angela. Fromthere on Sue Ellen added $1 to her piggy bank each week and Angelaput $2 in her piggy bank each week. How much money did Sue Ellen putin her piggy bank when they started?