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Solve the following system of equations with the substitution method:
`{(3 x + 12 y,=,-21),(x, =, -4 y -7):}`
Answer: ( , )
Enter your answers as integers or as reduced fractions in the form A/B. If there is no solution, type "DNE" in each blank. If there are an infinite number of solutions, specify their form in the blanks in terms of y.
`{(3 x + 12 y,=,-21),(x, =, -4 y -7):}`
Answer: ( , )
Enter your answers as integers or as reduced fractions in the form A/B. If there is no solution, type "DNE" in each blank. If there are an infinite number of solutions, specify their form in the blanks in terms of y.