Please help... answer a b c and d

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?

3x + 4y = 5 x- 3y = -7 solve by substitution

Can someone, me with this.i really need with this