Question 1134014
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Let w and r be the costs per pound of the wheat and rye flour, respectively.  Then the given information tells us<br>
{{{11w+10r = 14.65}}}
{{{13w+15r = 19.70}}}<br>
There are several ways to solve a system of equations like this.  When the two equations are both given, as they are in this problem, in the form Ax+By=C, I find elimination the easiest method.<br>
Triple the first equation and double the second; that will make both equations contain terms of 30r.  Then subtracting one equation from the other will eliminate r, allowing you to solve for w.  Then substitute the value you find for w in either of the original equations to solve for r.