Question 447905
.
substitution
a - 4b = 2
2a - 5b = 1
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        The solution in the post by @mananth is  INCORRECT.


        His answer  a = 1.08,  b = 0.23  is  INCORRECT.    These values do not satisfy second equation.


        So,  I came to solve the problem in a right way.



<pre>
From first equation, express  a = 4b+2 and substitute it into the second equation

    2(4b+2) - 5b = 1,

    8b + 4 - 5b = 1,

    3b = 1 - 4 = -3,

     b = -3/3 = -1.


Then  a = 4b+2 = 4*(-1) + 2 = -2.


<U>ANSWER</U>.  The solution is  a = -2,  b = -1.
</pre>

Solved correctly.