<PRE><B>Question 1152019</B>
{{{22+6x=28+4x}}} for x hours of usage



3 hours, they would be equal cost.




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A little more detail



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company A will rent the machine you need for $22 plus $6 per hour.
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If cost is A, then description is simple linear equation {{{A=6x+22}}}.



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Company B will rent the same machine for $28 plus $4 dollars per hour. 
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If cost is B, then rent will cost {{{B=4x+28}}}, as a simple linear equation.


For how many hours, x, will both A and B be the same?

{{{A=B}}}
{{{6x+22=4x+28}}}
{{{6x-4x=28-22}}}
{{{2x=6}}}
{{{highlight_green(x=3)}}}</PRE>