Question

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}