Shannif7ranuel Shannif7ranuel

01-12-2016
Mathematics

contestada

2 numbers sum is 7 product is -18

Respuesta :

01-12-2016

x+y=7
x•y=-18

x+y=7
x=7-y

x•y=-18
(7-y)•y=-18
7y-y^2=-18
-y^2+7y+18=0
Y^2-7y-18=0
(y-9)(y+2)=0
y is either 9 or -2

x+y=7
x=7-y
X=7-9
X=-2

X•y=-18
9•(-2)=-18
-18=-18

There you go, y is 9 and x is -2

Answer Link

Otras preguntas

What forces have contributed to the growth of the global economy?

what groups were in conflict in the south?

name three criticisms that were made of the catholic church in the 1500s

During the 14th century, the Black Death became a widespread epidemic primarily because of 1) the resurgence of trade 2) Chinese overseas exploration 3) Europea

Why do you think the line between the powers of the Federal Government and those of state governments was often not clearly drawn?

The figure shown is to be translated 5 units to the left and 2 units down. Which statement is true for the translated figure? A. It is smaller than the orig

Which statement describes an alternate theory of acids and bases? (1) Acids and bases are both H+ acceptors. (2) Acids and bases are both H+ donors. (3) Acids a

Which economic system has become associated with authoritarian governments and total control of the economy? capitalism mercantilism communism socialism barter

Using 6400 km as the radius of Earth, calculate how high above Earth’s surface you would have to be in order to weigh 1/16th of your current weight. Show all w

You have just purchased a 6-lb bag of apples for $4.80 at a local produce stand. How much would you expect to pay for a 10-lb bag of apples?