K_Algebra 1-5 Forms of linear equations

​About this unit

In this unit, we learn how to write linear equations in different forms to reveal different features of their relationships. 

Forms of linear equations 160/1100 Mastery points

• Intro to slope-intercept form
• Graphing slope-intercept equations
• Writing slope-intercept equations
• Point-slope form
• Standard form
• Summary

我有太多计算错误，所以分数很低。

I use slope to get a linear equation 

I don't understand why the solution in Khan so complicated, 70 is slope,  70* 10 =700. 700 + 800 = 1500 is the prouduction cost, thus, Net = 70x - 1500