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Solve the following systems of equations:
23x - 29y = 98
29x - 23y = 110

seo-qna
Last updated date: 29th Mar 2024
Total views: 409.2k
Views today: 11.09k
MVSAT 2024
Answer
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Hint – In this question simply add the two given equations and then divide by 52 all throughout, then we will be getting the value of x in terms of y. Substitute it back to any one of the equations given to get the values.

Complete step-by-step answer:
Given system of equations:
$23x - 29y = 98$............................. (1)
$29x - 23y = 110$..................... (2)
Now add these two equations we have,
$ \Rightarrow 23x - 29y + 29x - 23y = 98 + 110$
$ \Rightarrow 52x - 52y = 208$
Now divide by 52 throughout we have,
$ \Rightarrow x - y = 4$
$ \Rightarrow x = 4 + y$......................... (3)
Now substitute this value in equation (1) we have,
$ \Rightarrow 23\left( {4 + y} \right) - 29y = 98$
Now simplify this equation we have,
$ \Rightarrow 23 \times 4 + 23y - 29y = 98$
$ \Rightarrow - 6y = 98 - 92 = 6$
Now divide by 6 we have,
$ \Rightarrow - y = \dfrac{6}{6} = 1$
$ \Rightarrow y = - 1$
Now from equation (3) we have,
$ \Rightarrow x = 4 + \left( { - 1} \right) = 3$
So the required solution of the given system of equation is
$ \Rightarrow \left( {x,y} \right) = \left( {3, - 1} \right)$
So this is the required answer.

Note – This question could have been solved by another method in this simply we would be using a substitution method, using the first relation take out x in terms of y and put this relation back into the second equation, to get the value of the unknown variable. This method would be lengthy, therefore before applying this the equations are simplified by addition of them.




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