Răspuns:
[tex]\bf (a)\:\:\boxed{\bf x +2y+18=29}[/tex]
[tex]\bf (b)\:\:\boxed{\bf 3x +6y+38=62}[/tex]
[tex]\bf (c)\:\:\boxed{\bf 4x+4y+27=75}[/tex]
[tex]\bf (d)\:\:\boxed{\bf 15x+60y+38=113}[/tex]
Explicație pas cu pas:
(a)
[tex]\bf x +2y+13=24\:\Big|+5\:\:\text{\it adunam toata relatia cu 5}[/tex]
[tex]\bf x +2y+13+5=24+5[/tex]
[tex]\boxed{\bf x +2y+18=29}[/tex]
(b)
[tex]\bf 3x +6y+19=43\:\Big|+19\:\:\text{\it adunam toata relatia cu 19}[/tex]
[tex]\bf 3x +6y+19+19=43+19[/tex]
[tex]\boxed{\bf 3x +6y+38=62}[/tex]
(c)
[tex]\bf 2x+2y+38=62[/tex]
[tex]\bf 2x+2y=62-38[/tex]
[tex]\bf 2x+2y=24\:\Big|\cdot2\:\:\text{\it(Inmultim toata relatia cu 2)}[/tex]
[tex]\bf 4x+4y=48\:\Big|+27\:\:\text{\it(Adunam toata relatia cu 27)}[/tex]
[tex]\bf 4x+4y+27=48+27[/tex]
[tex]\boxed{\bf 4x+4y+27=75}[/tex]
(d)
[tex]\bf 5x+18+20y=43[/tex]
[tex]\bf 5x+20y=43-18[/tex]
[tex]\bf 5x+20y=25\:\Big|\cdot3\:\:\text{\it(Inmultim toata relatia cu 3)}[/tex]
[tex]\bf 15x+60y=75\:\Big|+38\:\:\text{\it(Adunam toata relatia cu 38)}[/tex]
[tex]\bf 15x+60y+38=75+38[/tex]
[tex]\boxed{\bf 15x+60y+38=113}[/tex]
==pav38==
