Scientists studying a certain species of frog found
that the population is decreasing by 35% each
year. The initial population of frogs was 750. Write
an equation that models the population y of frogs
remaining after x years.

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 =