If m=-1/2 and b=5, what is the correct slope intercept equation?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position

Acompany charges $0.10 for each letter engraved. bobby plans to spend no more than $5.00 on the engraving on a jewelry box. write and solve an inequality to find the maximum number of letters he can have engraved.