He finished with 18 points and grabbed nine rebounds. Sammy Foreman added a game-high 25 points.
Dunphy "shows a lot of support," Jordan said.
The 6-foot-3 point guard has whittled his college choices to the Owls, UCLA, and St. John's. He plans to announce his decision on April 15 and sign a letter of intent two days later.
In the third quarter, Jordan rushed on a fastbreak toward the basket which Dunphy was seated behind, faked a pass, and hit a layup before crashing to the floor.
In the fourth, he dished off the fastbreak as he delivered a behind-the-back pass to an open Khalief Tinley for a layup. Jordan laughed as he ran back on defense.
It was Vaux's second straight win over MC&S after the Cougars dropped an early-season game. Jordan said the difference this time was his team's ability to rebound.
"It was like playing another rival," he said. "It was a physical game. We just came out on top."
Foreman, a sophomore guard, scored 32 of his points in the fourth as Vaux countered a full-court press. With MC&S focused on Jordan, Foreman found himself open for driving layups.
"It was impressive," Jordan said. "I've seen him in games before, and I knew he could step up."
Jeremiah Worthem led MC&S with 26 points.
Vaux will play Johnsonburg in the final at 2 on Friday afternoon at Hershey's Giant Center. It is the first state-final appearance for the North Philadelphia school, which is slated to close after the school year.
"It would be great if we could all bring something home to remember," Jordan said.
Math, Civics & Sciences 10122024-66
MC&S: Kevon Alexander 2, Tyrese Hester 3, Britton Lee 9, Calil Moultrie 1, Jeffon Powell 9, Shafeek Taylor 5, Quadir Welton 11, Jeremiah Worthem 26.
V: Amir Butler 11, Sammy Foreman 25, Rysheed Jordan 18, Trayvond Massenburg 11, Karon Snead 5, Khalief Tinley 13.
Contact Matt Breen at email@example.com and @matt_breen on Twitter.