Math, asked by jahanv1942004, 2 months ago

if 173a +197b = 149 and 197a + 173b = 221, determine (a, b)​

Answers

Answered by MaheswariS
2

\textbf{Given:}

\mathsf{173a+197b=149}

\mathsf{197a+173b=221}

\textbf{To find:}

\textsf{The value of (a,b)}

\textbf{Solution:}

\textsf{Consider,}

\mathsf{173a+197b=149}____(1)

\mathsf{197a+173b=221}____(2)

\mathsf{(1)+(2)}

\mathsf{370a+370b+370}

\implies\mathsf{a+b+1}______(3)

\mathsf{(1)-(2)}

\mathsf{-24a+24b=72}

\implies\mathsf{-a+b=3}______(4)

\mathsf{a+b+1}______(3)

\mathsf{-a+b=3}______(4)

\mathsf{(3)+(4)\implies}

\mathsf{2b=4}

\implies\boxed{\mathsf{b=2}}

\mathsf{Put\;b=2\;in\;(1)}

\mathsf{a+2=1}

\implies\boxed{\mathsf{a=-1}}

\textbf{Answer:}

\mathsf{(a,b)=(-1,2)}

\textbf{Find more:}

Solve each of the following systems of equations by the method of cross-multiplication:

ax + by = a²

bx + ay = b²

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