The regression equation y = 5x + 23 approximates the number of people attending a picnic, y, given the number of flyers used to advertise it, x.

Which statement is true?

For every extra person attending a picnic, the number of flyers used to advertise it increases

by 23.

For every extra person attending a picnic, the number of flyers used to advertise it increases

by 5.

For every extra flyer used in advertising, the attendance increases by 23 people.

For every extra flyer used in advertising, the attendance increases by 5 people.