Question

a)Stiind ca x+y+z+11=43,determinati valoarea lui x+y+z
b)Daca 3•x+4•y+5•z+27=59,determinati 5•z+3•x+4•y
c)Stiind ca x-2•y+13=52,determinati 3•x-6•y+1

Answer 1

a) x+y+z=43-11
x+y+z=32
b)3x+4y+5z=59-27
3x+4y+5z=32⇒5z+3x+4y=32
c)x-2y=52-13
x-2y=39 |*3
3x-6y=117 |+1
3x-6y+1=118