Math 1 · Unit 3 · Lesson 3 · part 7 of 9
Each number does its job: change only m, or only b
m and b are the two numbers that pick one line out of the family, so they are exactly what let you eliminate.
Each number does its job: change only m, or only b
m and b are the two numbers that pick one line out of the family, so they are exactly what let you eliminate. In the first card only b changes between the equations; in the second only m changes. Feel each number doing its own job.