Can anyone help me with 8th grade imagine math? Lesson ; analyzing solution sets to linear equations with the variable on both sides

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t