The cost of a bag of chips in a vending machine is $0.85. the cost of a gatorade in the same machine is $1.50. kennedy spent $23.70 on chips and gatorade for her track team, and bought a combination of 21 bag of chips and gatorade. which step shows the first mistake in applying the elimination method to solve this problem? a) step1: - 0.85(x + y = 21) 0.85x + 1.50y = 23.70 b) step 2: - 0.85x + y = 21 0.85x + 1.50y = 23.70 c) step 3: 2.50y = 44.70 d) step 4: y = 17.88