HwaZiobro845 HwaZiobro845

04-06-2015
Mathematics

contestada

If x² - y² = 55, and x - y = 11, then y =
a. 8
b. 5
c. 3
d. -8
e. -3

Respuesta :

04-06-2015

x^2-y^2=55
this means that
(x+y)(x-y)=55
we know that x-y=11 so we can write
(x+y)(11)=55
x+y=55/11 we divide by 11 and we obtain
x+y=5

x-y=11 this means
x=y+11 we replace in the other equation (x+y=5)

y+11+y=5
2y=5-11
2y=-6
y=-3
and you find out that also
x=8

Answer Link

Otras preguntas

The United States ____ coffee beans and bananas from Latin America. Transports Exports Imports Teleports

How do genies actions show his feelings for Ernie

A recipe requires & cup of oil for every cup of water. How much oil (in cups) is needed per cup of water?

18 km 80km What is the length of the hypotenuse?

according to atticus what is optimistic about tom’s case

The cost of fabric varies directly with the amount of fabric purchased. If 1 1/3 yards of fabric cost $10.00, how much would 4 1/2 yards cost? A)14 $B)24 $C)27

After 1974 Supreme Court decision to what to types of institutions did the equal protection clause of the 14th amendment apply

PLEASE HELP ME ON BOTH QUESTIONS!!!!! Giving away 10 points!!!

what is the area of a rectangle of 5/9 m in length and 7/8 m in width

Please I need help I need it done by today