Describe the equation 3x+7y=8

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 =

Find the area of the triangle shown 3 by 6

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25