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Chapter 4: Problem 63
Multiply both sides of \(x-5 y=3\) by \(-4\) and simplify.
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Involve dual investments. You invest 7200 dollar in two accounts paying \(8 \%\) and \(10 \%\) annual interest. At the end of the year, the accounts earn the same interest. How much was invested at each rate?
Read Exercise \(72 .\) Then use a graphing utility to solve the systems. $$\left\\{\begin{array}{l}y=-x+5 \\ y=x-7\end{array}\right.$$
$$\text { Solve: } 2(x+3)=24-2(x+4)$$
In Exercises \(45-56,\) solve each system by the method of your choice. If there is no solution or an infinite number of solutions, so state. Use set notation to express solution sets. Explain why you selected one method over the other two. $$\left\\{\begin{aligned} 2 x-y &=10 \\ y &=3 x \end{aligned}\right.$$
In Exercises \(1-44,\) solve each system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express solution sets. $$\left\\{\begin{array}{l} 4(3 x-y)=0 \\ 3(x+3)=10 y \end{array}\right.$$
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