paid 21 for the book he kept for fi...

paid 21 for the book he kept for five days. Find the fixed charge and the charge for each extra day 3.4.3 Cross - Multiplication Method So far, you have learnt how to solve a pair of linear equations in two variables by graphical, substitution and elimination methods. Here, we introduce one more algebraic method to solve a pair of linear equations which for many reasons is a very useful method of solving these equations. Before we proceed further, let us consider the following situation The cost of 5 oranges and 3 apples is 735 and the cost of 2 oranges and 4 apples is ? 28. Let us find the cost of an orange and an apple.

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( cos t+0, quad sin u g u=x ) coet ob apple ( =y ) ( widehat{t} ) ( 5 x+3 y=35 rightarrow ) ( 2 x+4 y=28 ) ( 7-10 x+6 y=70 ) ( frac{-10 x+20 y=140}{14 y=70} ) begin{tabular}{r} ( 14=5 ) hline( x=4 ) end{tabular}
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