Solve a system of equations using augmented matrices
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5x + 4 y = 15
converting to augmented matrix
[ 5 4 15 ]
[ 0 1 5]
second row is already in the converted form , and shows y=5
put this value of y in 5x + 4 y = 15
5 x + 4 * 5 = 15
5x = 15 - 20
x = -5/5
x = -1
ANSWER IS y =5 and x= -1..................
Sofie brought chocolate and vanilla cupcakes to school for her birthday. 60 students decided to take a cupcake, and 70% of them picked vanilla. How many people picked a vanilla cupcake?
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