Can someone explain the directions , i just really don’t understand what it’s asking me- (repost 5)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?