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

Wich part of a country is away from the borders or coast? 1. lowlands 2. exterior 3. highlands 4. interior

Ellie's math teacher finds that there's roughly a linear relationship between the amount of time students spend on their homework and their weekly quiz scores.

Please help thank u very much

how did the compromise of 1850 affect African Americans?

3x^2+20x+12 pls show work ;-;

Mark has this image that he wants to convert to a digital image. What method should he use? Mark should prefer to convert this sketch into a digital image by __

i dont get the whole line graphing solution thing please help me out

What do you think was the reaction of the American public when they saw this image published in their local newspapers?

The points (-3,0) and (4,5) are plotted on a grid. Find the distance between the two points. Give your answer correct to 1 decimal place.

Which statement best describes heating by conduction?.