Find two numbers, if ... b Their sum is - 7 and their difference is 14

x=0

y=-21/7

Step-by-step explanation:

Let the two unknown be x and y

x+y=-7 ... (1)

x-y=14 ... (2)

From (1) make x the subject of formula

x=-7-y ... (3)

Substitute (3) into (2)

-7-y-y=14

-7-2y=14

Add 7 to both sides

-2y=21

Add both sides by-2

y=-21/2

Substitute the value of y into (3)

x=-7 - (-21/2)

x=-7+21/3

Lcm

x=-21+21/3

x=0/3

x=0