3k-1=7k+2

x-2y-3z=7
2x+y+z=-5
x+3y-2z=0
Find x, y and z.

Solve the following systems of equations by graphing
$\{\begin{array}{l}-2x+4y=12\\ y=\frac{1}{2}x\end{array}$

Find x, if
${\displaystyle -5+\left(\frac{x}{3}\right)=0}$

solve each problem by setting up and solving an appropriate system of equations. A small-town library buys a total of 35 books that cost $644. Some of the books cost $16 each, and the remainder cost $20 each. How many books of each price did the library buy?

14.4=−2.4b

Solve the equation:
${\displaystyle \sqrt[4]{4+8x}=2x^{\frac{1}{4}}}$