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

As a communicator, what are the three separate activities you engage in during the perception process?

What environmental condition contributed to the heat wave experienced in Europe and the thousands of deaths in France?

When people who are allergic to pollen come in contact with pollen, their eyes begin to water and itch due to the release of?

Which method is a faster, easier, and more convenient way of job searching than looking at newspaper ads?direct searchInternet searchword of mouthemployment age

"The cure for our conceit and stubborn pride Like Plato here with Galen, side by side; Through love the earthly form soars heavenward, The mountain dances nimbl

The three parts of the CPT manual are the main text, the appendices, and the alphabetic index

my teacher said to me,"have you done your homework?"

What is 18,157 rounded to the nearest thousand

42-(35+3)+10=?????????????

Jess and Ann have decided to exchange messages using the Caesar cipher. If the predetermined key is seven places to the left, then what will bethe cipher text o