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

Sam says, "All tigers have stripes." Bob says, "I see a tiger!" What conclusion can Sam draw? What Law did he use to reach that conclusion?

List 1 inherited trait that is ONLY based on genetics and is NOT affected by the environment in any way.

DONT delete my question or else!!! AM i a awful person??

Aiko says to find the LCM, you can just multiply the two numbers. As a teacher, how do you respond?

Any gïrls here free to talk

Plants store _____ energy in their tissues. A mechanical B heat C light D chemical

I need help with project

PROJECT: SUMMARIZE IT! The ability to summarize information is a vital component of understanding the information you read in your coursework. To summarize info

Sam says, "All tigers have stripes." Bob says, "I see a tiger!" What conclusion can Sam draw? What Law did he use to reach that conclusion?

Roxy's new employer pays employees bimonthly, which is twice a month. She'll earn $30 per hour with the new company. She plans to continue making extra money by