Chapter 8.10, Problem 4BCYP

To determine

The solution of the $y=7-x$ and $x=3$ by using the substitution method

Answer to Problem 4BCYP

The solution of $y=x+2$ and $x=3$ is $x=3,y=4$

Explanation of Solution

Given:

The two eqn are as:

  $\begin{array}{l}y=7-x\\ x=3\end{array}$

Calculation:

The two eqns. are described as:

  $y=7-x$  .... (1)

  $x=3$  .... (2)

Put the value of the $x=3$ in eq. (1):

  $\begin{array}{l}y=7-x\\ y=7-3\\ y=4\end{array}$

So, the value of $x=3$ and $y=4$ .

Conclusion:

Hence, the solution of the eqns. is $x=3$ and $y=4$ .