Question 1093235
L = 3B+15,000
L + B = 295,000 substitute for L:
3B+15,000+B = 295,000
4B = 280,000
B = 70,000
and 
L = 3B+15,000 = 3(70,000)+15,000 = 210,000+15,000 = 225,000