Question 32939: Solution Classification of a Linear System

Original question and givens

Over the reals, the constraints (1)x+(7)y=9 and (2)x+(14)y=19 must both hold. Classify the system as no solution, a unique solution, or infinitely many solutions. Zero-coefficient rows are allowed.

• G001 — Over the reals, the constraints (1)x+(7)y=9 and (2)x+(14)y=19 must both hold. Classify the system as no solution, a unique solution, or infinitely many solutions. Zero-coefficient rows are allowed.

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

• mko-system-linear-equations

Step-by-step derivation

source roles = [qf-linear-system-solution-class, solution_class, reals, []]

derived = [[SOURCE_solution_class_STRING]]

source roles = [[[1, 7, 9], [2, 14, 19]]]

derived = [[coefficient_x, coefficient_y, right_side]]

System ORIGINAL a times e main product := mul(1, 14)

System ORIGINAL a times e main product = 14

System ORIGINAL b times d other product := mul(7, 2)

System ORIGINAL b times d other product = 14

System ORIGINAL signed determinant ae minus bd := sub(14, 14)

System ORIGINAL signed determinant ae minus bd = 0

source roles = [[[1, 7, 9], [2, 14, 19]]]

derived = [14, 14, 0]

source roles = [[[1, 7, 9], [2, 14, 19]], 0]

derived = [[]]

System rank1 ORIGINAL a times f augmented minor := mul(1, 19)

System rank1 ORIGINAL a times f augmented minor = 19

System rank1 ORIGINAL c times d augmented minor := mul(9, 2)

System rank1 ORIGINAL c times d augmented minor = 18

System rank1 ORIGINAL augmented x minor := sub(19, 18)

System rank1 ORIGINAL augmented x minor = 1

System rank1 ORIGINAL b times f augmented minor := mul(7, 19)

System rank1 ORIGINAL b times f augmented minor = 133

System rank1 ORIGINAL c times e augmented minor := mul(9, 14)

System rank1 ORIGINAL c times e augmented minor = 126

System rank1 ORIGINAL augmented y minor := sub(133, 126)

System rank1 ORIGINAL augmented y minor = 7

source roles = [[[1, 7, 9], [2, 14, 19]]]

derived = [1, 7, No]

Reverse checks

• S014 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S013 · premise_and_result_audit — Recompute System rank1 ORIGINAL augmented y minor with exact rational arithmetic, not rounded decimals.
• S012 · premise_and_result_audit — Recompute System rank1 ORIGINAL c times e augmented minor with exact rational arithmetic, not rounded decimals.
• S011 · premise_and_result_audit — Recompute System rank1 ORIGINAL b times f augmented minor with exact rational arithmetic, not rounded decimals.
• S010 · premise_and_result_audit — Recompute System rank1 ORIGINAL augmented x minor with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute System rank1 ORIGINAL c times d augmented minor with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Recompute System rank1 ORIGINAL a times f augmented minor with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S006 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S005 · premise_and_result_audit — Recompute System ORIGINAL signed determinant ae minus bd with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute System ORIGINAL b times d other product with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute System ORIGINAL a times e main product with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S001 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.

Result

no solution

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.