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

Question: 35/8 ( write as mixed number ) Please help me very very quickly!!!!!!!!!!!!!!!!!!!

One way to show that a statement is NOT a good definition is to find a _____ converse.conditional.counterexample.biconditional.

A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, what is the input voltage?A. 8 volts

I = {1, 2} List all possible subsets of the given set.

how do I solve x+2y=8

distribute (x+1)(x-2)

Kim estimates that the faucet in her kitchen drips at a rate for 1 drop every 2 seconds. Erik wants to klnow how many times the faucet drips in a week.

what city is located 60 north 25 east

among the qualities listed on the human relations scale, the most important one for the building new relationship is?

. What are three factors that could contribute to a source not being credible?