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## What was Dimitri’s mistake? He mixed up the coordinates of the ordered pair when Substituting it into the equations 7x+9y=-4 and 5x-2y=6

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What was Dimitri’s mistake? He mixed up the coordinates of the ordered pair when Substituting it into the equations 7x+9y=-4 and 5x-2y=6

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Mathematics
3 years
2021-08-26T10:22:56+00:00
2021-08-26T10:22:56+00:00 1 Answers
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## Answers ( )

Answer:He made a mistake in his calculations when simplifying 5x – 2y

Step-by-step explanation:GivenThe coordinate pairThe equationsDimitri’s SolutionRequiredIdentify Dimitri’s mistake

In the first equation, Dimitri made no mistake.However, he made a mistake when simplifying the second equation.We have:andSubstituteandSo, we have:Open bracketFinally, we have: