Unit 5-Day 2 

Daily Objective- "Students will write the linear equation of a line using data from a line of best fit, or 2 given points." 

• Finding the equation of a line doesn't involve as much work as you'd think. You first must set the equation up in y=mx+b form. Then you begin by finding the slope. You find slope by setting (y2-y1) over (x2-x1). (X, then Y) After finding the slope of the line you insert a x value in for your x, and a y value for y. Say Y=2 and X=5. (Using y=mx+b) You insert your two values. 2=5x+b. B= -3. If you are solving an equation, such as y=2x+3,Simple enough... Right? 

Quiz

1. Josiah's plumbing company charges 96$ per hour, plus 10$ show up fee. Write an equation for Jo's plumbing company. 
2. There are two points on a graph, (12,3) (4,-5) What is the slope? 
3. 3=2(12)+b. What is B? 

Answer Key

1. y=96x+10. (96 per hour. hours=x. Plus a 10$ show up fee. y=96x+10) 
2. Slope=1. (3 - -5=8. 12-4=8. 8 over 8=1)
3. -21 (2 times 12= 24. 24-21=3. 3=3)