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ICSE Class 8 Answered

Use the method of substitution to solve each other of the pair of simultaneous equations: 11y+15x=-23;7y-2x=20
Asked by Cl_narayan | 23 Jan, 2020, 08:11: AM
answered-by-expert Expert Answer
11 straight y plus 15 straight x equals negative 23... open parentheses 1 close parentheses 7 straight y minus 2 straight x equals 20 straight x equals fraction numerator 7 straight y minus 20 over denominator 2 end fraction... open parentheses 2 close parentheses sub space open parentheses 2 close parentheses space in space open parentheses 1 close parentheses 11 straight y plus 15 open parentheses fraction numerator 7 straight y minus 20 over denominator 2 end fraction close parentheses equals negative 23 22 straight y plus 105 straight y minus 300 equals negative 46 127 straight y equals 254 straight y equals 2 straight x equals negative 3
Answered by Arun | 23 Jan, 2020, 11:39: AM

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