SME
Grade 8 Math
Systems of two linear equations
The main lesson, then each kind of problem it solves.
Systems of two linear equations
Main lesson
When do two plans cost the same?
Use this for “Gym A: $150 to join and $20 a month. Gym B: $60 and $35. When do they cost the same?”
How many of each
Use this for “8 tickets cost $41. Adult tickets are $7 and child tickets $4. How many of each?”
Lines written ax + by = c
Use this for “Which point is on both 2x + y = 9 and x − y = 3?”
How many solutions does the system have?
Use this for “Do y = 3x − 2 and y = 3x + 5 have a solution?”