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

One of the economic challenges Japan has faced in recent years is a. isolation. b. limited government. c. unlimited government. d. recession.

Given the following solutions:Solution A: pH of 10Solution B: pH of 7Solution C: pH of 5 Which list has the solutions placed in order of increasing H + concentr

A horizontal 20.-newton force is applied to a 5.0-kilogram box to push it across a rough, horizontal floor at a constant velocity of 3.0 meters per second to th

A 'snail's pace is 60 inches per minute. At this rate how long will it take the snail to crawl 120 feet?

What international governmental organization did the United States decline to join after World War I? a. Non-Aligned Movement b. The League of Nations c. Nor

One angle is 36°. What is the measure of its complement? A) 54° B) 64° C) 144° D) 324°

Find the acceleration of a train whose speed increases from 7m/s to 17 m/s in 120s

PLEASE HELP ME! In the figure shown, the measure of angle 6 is 141º. What is the measure of angle 5?

Read this line from the passage: That, and thy repentance, may avail to take the scarlet letter of thy breast Which theme of the story does the scarlet letter

How did the bourgeoisie differ from the people from the third estate?