Eight times a number plus five times another number is -13.The sum of the two numbers is 1, what are the two numbers?

Question

its either 

a.7 and -6

or

b.6 and -7

or

c.-7 and 8

0r

d.-8 and 9

Answer 1

If  x and y are two numbers, then

8x+5y=-13

x+y=1

x=-6

y=7