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.

He mixed up the coordinates of the ordered pair when substituting it into the equations 7x + 9y = –4 and 5x – 2y = 6.

He checked the equation 7x + 9y = –4 first when he should have checked first.

He made a mistake in his calculations when substituting the ordered pair into the equation 7x + 9y = –4 and simplifying.

He made a mistake in his calculations when substituting the ordered pair into the equation 5x – 2y = 6 and simplifying.