s5177
21.04.2020 •
Mathematics
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.
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Ответ:
D. He made a mistake in his calculations when substituting the ordered pair into the equation 5x -2y =6 and simplifying.
Step-by-step explanation: I got the answer correct on a test. Hope this helps!
Ответ:
Step-by-step explanation:
(a) matched pairs experiment, since the experiment is carried out twice on the same set of students.
(b) randomized comparative experiment , since the 2 video-game player groups are independent
(c) randomized comparative experiment , since the 2 math majors groups are independent.
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