Question

The pair of equations {r+b=12, r−b=3} has exactly one solution. Write that solution:
b=?, r=?

Answer 1

Answer:

r=7.5,b=4.5

Step-by-step explanation:

By adding equation r+b=12 and r-b=3, (+b and -b cut each other)

• =>we get 2r = 15
• =>r=7.5
• =>by substituting value of r in any of the given equation like r-b=3,   we  get  7.5-b=3
• hence b value is 4.5