Question

a=y-7, b=y-4 and y²=100 If a>0 and b<0, a+b= ?

Answer 1

Answer:

When y=2,x=4. When y=4,x=2. Explanation: x+y=6 ...................Eq1. x2+y2=20 ......... .....Eq2. Using the identity: x2+y2=(x+y)2−2xy.

Answer 2

Answer

-11

Step-by-step explanation:

y^2=100

y=10, -10

a=y-7 b=y-4

a=10-7 b=-10-4

a=3 b=-14

a+b=3+(-14)=-11