document.write( "Question 166215: Hi there please help I am parent trying to help my eldest on Equation in year 9, this the question, This is where I am stuck because I don't if my equation is correct or not?
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document.write( "thanks Nick. \n" );
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Algebra.Com's Answer #122489 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! In two years time Geoff will be three times as old as he was ten years ago. \n" ); document.write( " a)Using y for his present age, write down an equation connecting his present \n" ); document.write( " age with his age ten years ago? \n" ); document.write( ": \n" ); document.write( "Two things to note in this: \n" ); document.write( ": \n" ); document.write( "Age in two years: (y+2) \n" ); document.write( "Age 10 yrs ago: (y-10) \n" ); document.write( ": \n" ); document.write( "In two yrs = 3 times age 10 yrs ago \n" ); document.write( "y + 2 = 3(y - 10) \n" ); document.write( ": \n" ); document.write( "b)Solve the equation. \n" ); document.write( ": \n" ); document.write( "y + 2 = 3y - 30; multiplied what's inside the bracket \n" ); document.write( ": \n" ); document.write( "y + 2 + 30 = 3y; add 30 to both sides \n" ); document.write( ": \n" ); document.write( "32 = 3y - y; subtract y from both sides \n" ); document.write( ": \n" ); document.write( "y = \n" ); document.write( ": \n" ); document.write( "y = 16 yrs; his age now \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Try this in the original statement, see if works \n" ); document.write( "\"In two years time Geoff will be three times as old as he was ten years ago.\" \n" ); document.write( "16 + 2 = 3(16 - 10) \n" ); document.write( "18 = 3(6) \n" ); document.write( ": \n" ); document.write( "You don't need brackets around the problem \n" ); document.write( " \n" ); document.write( " |