Question

if R+r=12 then solve R-r=2 and R+r=12 ​

Answer 1

Answer:

R = 7 and r = 5

Step-by-step explanation:

Answer 2

Answer:

R = 7, r = 5.

Step-by-step explanation:

R-r=2

R+r=12

Using elimination method, add both eq., so +r and -r will be canceled. Now we get:

R + R = 2 + 12

2R = 14

R = 14/2 = 7.

Now substitute  the value R = 7 to any of the eq.

R-r = 2

7-r = 2

-r = 2-7 = -5

r = 5