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 3 years ago
PLEASE HELPP (:
If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the first equation. x6y+3z=0 2x5y+8z=7 x+7y4z=13
 3 years ago
PLEASE HELPP (: If you were to use the substitution method to solve the following system, choose the new system of equations that would result if x was isolated in the first equation. x6y+3z=0 2x5y+8z=7 x+7y4z=13

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phantom
 3 years ago
Best ResponseYou've already chosen the best response.0plug in x= 6y3z in eqns 2 and 3 in place of x to get 2 eqns in y and z only

waleed_kha
 3 years ago
Best ResponseYou've already chosen the best response.0x6y+3z=0..........................1 2x5y+8z=7........................2 x+7y4z=13.........................3 Take eq 1 x= 6y3z sub this in equation 2 and 3 2( 6y3z)5y+8z=7..................2 6y3z +7y4z=13.....................3 simplify 12y6z5y+8z=7 then it be 7y+2z=7................2 multiplying by 7 13y7z=13..............3 multiplying by 2 49y+14z=49 .............2 26y14z=26...............3 adding both equations to each other to get 75 y = 75 then y=1 sub value of y in 2 or 3 to get 7+2z=7 2z=0 z= zero sub z= zero , y =1 , in eq 1 x= 6y3z x=6 Hope I'm right . and You are welcome .. regards
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