Mathematics
wglenda26
3

The sum of two angles is 71∘. Angle 2 is 49∘ smaller than 2 times angle 1. How do I do this type of problem? How do I figure it out?

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(1) Answers
katiebabyyy

Let's call [latex]\begin{Bmatrix}Angle~1&=&x\\Angle~2&=&y\end{matrix}[/latex] OK?! so [latex]\begin{Bmatrix}x+y&=&71\º\\y&=&2x-49\º\end{matrix}[/latex] we can replace at the first row [latex]\begin{Bmatrix}x+2x-49&=&71\º\\y&=&2x-49\º\end{matrix}[/latex] [latex]\begin{Bmatrix}3x&=&71\º+49\º\\y&=&2x-49\º\end{matrix}[/latex] [latex]\begin{Bmatrix}3x&=&120\º\\y&=&2x-49\º\end{matrix}[/latex] [latex]\begin{Bmatrix}x&=&40\º\\y&=&2x-49\º\end{matrix}[/latex] now we can find the second angle... what we just have to do is replace the value that we find to x at the second row [latex]\begin{Bmatrix}x&=&40\º\\y&=&2*40\º-49\º\end{matrix}[/latex] [latex]\begin{Bmatrix}x&=&40\º\\y&=&80\º-49\º\end{matrix}[/latex] [latex]\begin{Bmatrix}x&=&40\º\\y&=&31\º\end{matrix}[/latex] [latex]\boxed{\boxed{\therefore\begin{Bmatrix}Angle~1&=&40\º\\Angle~2&=&31\º\end{matrix}}}[/latex]

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