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OpenStudy (anonymous):

Given the system of equations, what is the value of the y-determinant? 3x + y - 10 = 0 4x - y - 4 = 0 -28 -14 28

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OpenStudy (amistre64):

id swap ys for constants \[\begin{vmatrix}D_x&D&D_y \\3&-10&1 \\4&-4&-1 \end{vmatrix}\] \[D_y=\begin{vmatrix}\cancel{D_x}&\cancel{D}&\cancel{D_y} \\3&-10&\cancel{1} \\4&-4&\cancel{-1} \end{vmatrix}=3(-4)-4(-10)\]

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