Solve {l}{y=1}{y=-2x+6}{z=5x-1}{text{Solvefor}atext{where}}{a=z}

$$\left. \begin{array} { l } { y = 1 }\\ { y = -2 x + 6 }\\ { z = 5 x - 1 }\\ { \text{Solve for } a \text{ where} } \\ { a = z } \end{array} \right.$$

Solve for y, x, z, a

$$a = \frac{23}{2} = 11\frac{1}{2} = 11.5$$

Solution Steps

Consider the second equation. Insert the known values of variables into the equation.

$$1=-2x+6$$

Swap sides so that all variable terms are on the left hand side.

$$-2x+6=1$$

Subtract 6 from both sides.

$$-2x=1-6$$

Subtract 6 from 1 to get -5.

$$-2x=-5$$

Divide both sides by -2.

$$x=\frac{-5}{-2}$$

Fraction \frac{-5}{-2} can be simplified to \frac{5}{2} by removing the negative sign from both the numerator and the denominator.

$$x=\frac{5}{2}$$

Consider the third equation. Insert the known values of variables into the equation.

$$z=5\times \frac{5}{2}-1$$

Multiply 5 and \frac{5}{2} to get \frac{25}{2}.

$$z=\frac{25}{2}-1$$

Subtract 1 from \frac{25}{2} to get \frac{23}{2}.

$$z=\frac{23}{2}$$

Consider the fourth equation. Insert the known values of variables into the equation.

$$a=\frac{23}{2}$$

The system is now solved.

$$y=1 x=\frac{5}{2} z=\frac{23}{2} a=\frac{23}{2}$$