Find two numbers and and b whose sum a + b is − 7 , and whose difference a − b is 1 .

Question

Find two numbers  and  whose sum  is , and whose difference  is .Your answer is

Answer 1

a+b=-7

a-b=1

add those 2 equations to get

2a =-6

divide by 2

a =-6/2 = -3

b=-7-1 = -7 -(-3) = -7+3 = -4

Answer 2

a + b = -7

a - b = 1

a = -3 and b = -4

(-3) + (-4) = -7

(-3) - (-4) = (-3) + 4 = 1