6.03] If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step?
3x + y = 6
4x − 5y = 10
Multiply the first equation by 5.
Multiply the first equation by −5.
Multiply the first equation by −4.
Add the two equations together.
Question 5 (Multiple Choice Worth 4 points)
[6.02] For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?
3x + y = 8
−x − y = −7
−y + 7
−y − 7
y + 7
y − 7

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