Which ordered pairs are solutions to the equation 4x+15y=12?

How can you decide witch operations to use to slice a two step equation

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8