What is the solution to y=x+16 and y=-x+4? ?

show work and explanation in how its
so i can understand better cause i'm new to these
so i can get all the i can get (:

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!