Question

2x+9y+18z,daca x+3y=28;y+6z=43;3y+18z=129.va rog detailat

Answer 1

2 x + 9 y + 18 z = 185

=(  x + x )  + ( 3 y + 3 y + 3 y )  + 18 z =

= ( x + 3 y ) + ( x + 3 y ) + ( 3 y + 18 z ) =

= 28 + 28 + 129 =

= 185

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sau:

2 x + 6 y + 3 y + 18 z = 2 ( x + 3 y ) + ( 3 y + 18 z ) = 2 x 28 + 129 = 56 + 129 = 185