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

Determine whether each ordered pair is a solution to the inequality x+y<−1.

The figure below is composed of eight circles, seven small circles and one large circle containing them all. Neighboring circles only share one point, and two r

The program can both _________ and entertain young audiences.

Find the quotient. 4 z a + 2 ÷ ( − 8 z a − 2 ) − 1 2 z 2 a − 1 2 z − 1 2 z 4

A bowling ball pushes a pin down. What is the reaction force? A. The pin pushes back on the bowling ball. B. The lane pushes back onto the bowling ball C. Th

Read the following paragraph. Some schools are adopting year-round schedules, but I believe that long summer vacations are beneficial and necessary. First of al

The demand curve in a purely competitive industry is ______, while the demand curve to a single firm in that industry is ______.

Can someone please help its due today and im so bad at chemistry

Which term describes a line segment that connects a vertex of a triangle to a point on the line containing the opposite side, so that the line segment is perpen

Need help with homework A school fundraiser has a minimum target of $600. Faculty donated $200 and there are 10 student clubs that are participating with differ