document.write( "Question 925931: John is 6 years older than his brother. The sum of their ages is 30. How old are John and his brother?
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Algebra.Com's Answer #561848 by TimothyLamb(4379)![]() ![]() You can put this solution on YOUR website! x = john age now \n" ); document.write( "y = brother age now \n" ); document.write( "--- \n" ); document.write( "x = y + 6 \n" ); document.write( "x + y = 30 \n" ); document.write( "--- \n" ); document.write( "put the system of linear equations into standard form \n" ); document.write( "--- \n" ); document.write( "x - y = 6 \n" ); document.write( "x + y = 30 \n" ); document.write( "--- \n" ); document.write( "copy and paste the above standard form linear equations in to this solver: \n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "--- \n" ); document.write( "solution by matrix method: \n" ); document.write( "x = john age now = 18 \n" ); document.write( "y = brother age now = 12 \n" ); document.write( "--- \n" ); document.write( "by elimination: \n" ); document.write( "--- \n" ); document.write( "x - y = 6 \n" ); document.write( "x + y = 30 \n" ); document.write( "--- \n" ); document.write( "add the two above equations: \n" ); document.write( "2x = 36 \n" ); document.write( "x = 18 \n" ); document.write( "--- \n" ); document.write( "18 + y = 30 \n" ); document.write( "y = 12 \n" ); document.write( "--- \n" ); document.write( "solution by elimination method: \n" ); document.write( "x = john age now = 18 \n" ); document.write( "y = brother age now = 12 \n" ); document.write( "--- \n" ); document.write( "Solve and graph linear equations: \n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php \n" ); document.write( "--- \n" ); document.write( "Solve quadratic equations, quadratic formula: \n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php \n" ); document.write( "--- \n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables: \n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( " |