Here is a problem and three related equations. Anita buys 6 large beads and 20 small beads to make a necklace. Ivan buys 4 large and 25 small beads for his necklace. Jill selects 8 large and 16 small beads to make an ankle bracelet. Without tax, Anita pays $2.70, and Ivan pays $2.85. How much will Jill pay?

a. What do the variables L, S, and J represent?
b. What are the units of L, S, and J?
c. What does Equation 1 represent?

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r6L +ms= 270 (Equation 1) 4L+ 255 = 285 (Equation 2) ,8L + 165 = J (Equation 3)