Which first step for solving the given system using substitution results in an equation without fractions? 3 x plus y is equal to 9 5 x minus 3 y is equal to 1

Solve for y in the first equation: 3x + y = 9 gives y = 9 − 3x, with no fractions. Substituting this into the second equation gives 5x − 3(9 − 3x) = 1, also without fractions. The correct choice is D, “Solve for y in the first equation.”

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