Can you help me please I’ll give brainliest

Can someone explain the elimination method to me for this problem?

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =