2 numbers that add up to 6 but also when multiplied -7 is the outcome

Let the numbers be x and y

According to the data : xy=-15 and x+y=-7

xy=-15

x+y=-7

y=-7-x

x(-x-7)=-15

y=-7-x

-x^2-7x=-15

y=-7-x

x^2+7x-15=0

y=-7-x

x=(-7±sqrt(7*7+4*15))/2

y=-7-x

x=(-7±sqrt(109))/2

Goes to two systems.

1)  

y=-7-x

x=(-7+sqrt(109))/2

y=-7+3.5-sqrt(109))/2

x=(-7+sqrt(109))/2

y=-3.5-sqrt(109))/2

x=(-7+sqrt(109))/2

2)

y=-7-x

x=(-7-sqrt(109))/2

y=-7+3.5+sqrt(109))/2

x=(-7-sqrt(109))/2

y=-3.5+sqrt(109))/2

x=(-7-sqrt(109))/2

Step-by-step explanation:

i think it is c, not positive though

step-by-step explanation: