Answer:
W + R = 15 and R = 6w + 3
Step-by-step explanation:
Let Dylan has red marbles = R and number of white marbles = W
Now we will form the equation.
"Dylan has total number of marbles = 15"
R + W = 15 ----------------(1)
"Number of red marbles is three more than 6 times the number of white marbles."
R = 6w + 3 -------------(2)
Therefore, system of equations will be
W + R = 15
and R = 6w + 3