Question

Se X + Y=21/10 e X/Y=15/16 determine x e y

Answer 1

X/Y = 15/16
MULTIPLIQUE  EM CRUZ
16X = 15/Y
X = 15Y/16
SUBSTITUI NA SOMA
X + Y = 21/10
( 15Y/16) + Y/1 = 21/10
MMC 80
( 75Y ) + 80Y  = 168
155Y  = 168
Y = 168/155 *****

X = 15 (168/155)/16
X =( 2520 /155 )/16  = 2520/155 * 1/16 = 2520/2480 = 252/248  = 63/62 ****