pelkey
Answered

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which statement is true about the following system of equations?
3x-1/2y=1
x+2y=7

Sagot :

AL2006
Many many true statements could be offered regarding those two equations.
Sadly, until you share the list of choices you're looking at, there's no way for
anyone to help you choose the best one.
Lilith
[tex]\begin{cases} 3x- \frac{1}{2}y=1 \ \ / \cdot 4\\ x+2y=7 \end{cases}\\\\\begin{cases} 12x- 2y=4 \\ x+2y=7 \end{cases}\\+ -------\\13x = 11\ \ / :13\\\\x=\frac{11}{13}[/tex]

[tex]x+2y=7 \\ \\ \frac{11}{13}+2y=7\\ \\2y=7-\frac{11}{13} \\ \\2y=\frac{91}{13}-\frac{11}{13}\\ \\2y =\frac{80}{13}\ \ / \cdot (\frac{1}{2})\\ \\y=\frac{40}{13} \\\\\begin{cases} x=\frac{11}{13}\\ y= \frac{40}{13} \end{cases} [/tex]

 

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