\left\{ \begin{array} { l } { y = - 1 } \\ { - 3 x + 2 y = 21 } \end{array} \right.
Solve for y, x
x = -\frac{23}{3} = -7\frac{2}{3} \approx -7.666666667
y=-1
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-3x+2\left(-1\right)=21
Consider the second equation. Insert the known values of variables into the equation.
-3x-2=21
Multiply 2 and -1 to get -2.
-3x=21+2
Add 2 to both sides.
-3x=23
Add 21 and 2 to get 23.
x=-\frac{23}{3}
Divide both sides by -3.
y=-1 x=-\frac{23}{3}
The system is now solved.
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