How do you find the intersection between 2 lines?

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.

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Solving algebraic equations 2m+3=11