Question

1.Perimetrul unui dreptungi este 90m,iar lungimea de 4 ori mai mare decat latimea.Afla lungimea si latimea

Answer 1

2x+2y=90
x=4y
4y+4y+2y=90
10y=90
y=90:10
y=9
x=9·4
x=36
36·2+9·2=72+18=90
x=lungimea
y=latimea

Answer 2

2x+2y=90 x=4y 4y+4y+2y=90 10y=90 y=90:10 y=9 x=9·4 x=36