Question

1x - 3y -7 =0 3x - 3y - 15 =0 cross multiplication​

Answer 1

Answer:

$1\cdot \:x-3y-7=0,\:3x-3y-15=0\quad :\quad x=4,\:y=-1$

Step-by-step explanation:

$\begin{bmatrix}1\cdot \:x-3y-7=0\\ 3x-3y-15=0\end{bmatrix}$

$\mathrm{Substitute\:}x=3y+7$

$\begin{bmatrix}3\left(3y+7\right)-3y-15=0\end{bmatrix}$

$\begin{bmatrix}6y+6=0\end{bmatrix}$

$\mathrm{For\:}x=3y+7$

$\mathrm{Substitute\:}y=-1$

$x=3\left(-1\right)+7$

$x=4$

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}$

$x=4,\:y=-1$

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