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solve the system of equations. which answer choice has truth to it's solution?y=X+7y=1/4x+11/2multiple choice options:x=-2x=-3y=6y=7y=11/2please show work!

Solve The System Of Equations Which Answer Choice Has Truth To Its SolutionyX7y14x112multiple Choice Optionsx2x3y6y7y112please Show Work class=

Sagot :

Given the System of Equations:

[tex]\begin{cases}y=x+7 \\ \\ y=\frac{1}{4}x+\frac{11}{2}\end{cases}[/tex]

You can apply the following steps in order to solve it using the Substitution Method:

1. Substitute the second equation into the first equation:

[tex]\frac{1}{4}x+\frac{11}{2}=x+7[/tex]

2. Solve for "x":

[tex]\begin{gathered} \frac{1}{4}x-x=7-\frac{11}{2} \\ \\ -\frac{3}{4}x=\frac{3}{2} \end{gathered}[/tex]

[tex]\begin{gathered} x=(\frac{3}{2})(-\frac{4}{3}) \\ \\ x=-\frac{12}{6} \\ \\ x=-2 \end{gathered}[/tex]

3. You can substitute the value of "x" into the first original equation:

[tex]\begin{gathered} y=x+7 \\ y=(-2)+7 \end{gathered}[/tex]

4. Evaluating, you get this value of "y":

[tex]\begin{gathered} y=-2+7 \\ y=5 \end{gathered}[/tex]

Hence, the answer is: First option.