9
QuizMultiple Choice
Unit Test — Unit test
Question 9 of 15 • 2025-2026_MDCPS_1205070-M/J Grade 8 Pre-Algebra Sem 1-CR
Dimitri determined that the ordered pair (2, –2) is a solution to the system of linear equations 7x + 9y = –4 and 5x – 2y = 6 as shown.What was Dimitri’s mistake?
Answer
A
He mixed up the coordinates of the ordered pair when substituting it into the equations 7x + 9y = –4 and 5x – 2y = 6.B
He checked the equation 7x + 9y = –4 first when he should have checked first.
C
He made a mistake in his calculations when substituting the ordered pair into the equation 7x + 9y = –4 and simplifying.D
He made a mistake in his calculations when substituting the ordered pair into the equation 5x – 2y = 6 and simplifying.