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27-01-2015
Mathematics

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Question 4. 4. What is the y-coordinate of the solution to the system of equations?
x- y = - 11
y+7 = - 2x

Respuesta :

27-01-2015

[tex]x-y=-11 \\ \underline{y+7=-2x} \\ x+7=-11-2x \\ x+2x=-11-7 \\ 3x=-18 \ \ \ |\div 3 \\ x=-6 \\ \\ x-y=-11 \\ -6-y=-11 \ \ \ |+6 \\ -y=-5 \ \ \ |\times (-1) \\ y=5 \\ \\ (x,y)=(-6,5)[/tex]

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