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## Warm-up

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**Warm-up**You are driving on a road trip and you want to find out how many hours total it will take you to get to California. After driving for 4 hours, you were 280 miles from home. You are now 520 miles from home and have driven for 8 hours. How long will it take you to drive 3000 miles?**3 Forms**Slope-Intercept Point-Slope Standard **Always have the variables x & y****Slope Intercept**m is the slope of the line b is the y-intercept of the line**Example**1) Write the equation of the line that has a slope of 4, and a y-intercept of -2. 2) Write the equation of the line between the points (2, 4) and (4, 12).**Example**3) Write the equation of the line pictured.**Point-Slope**(x1, y1) is a point on the line m is the slope of the line**Examples**• Write the equation of the line that passes through the point (4, -2) and has a slope of 6. 5) Write the equation of the line that passes through the points (1, 8) and (-2, 6).**Standard Form**Where A, B & C are integers A is NOT negative**Putting Equations into Standard Form**1) Put the equation into slope-intercept form. 2) Subtract mx from both sides (EX: y = 3x + 7 becomes –3x + y = 7) 3) If the number in front of x is negative, multiply everything by -1. 4) If the number in front of x is a fraction, multiply everything by the denominator.**Examples**• Write the equation of the line that passes through the points (2, 6) and (3, -3) in standard form. • Write the equation of the line that has slope -5 and passes through the point (1, -4) in standard form. • Write the equation of the line through the points (3, -5) and (7, 1) in standard form.**Pop Quiz**• You are given the slope of a line and a point on the line. How can you find an equation of the line? • You are given the slope of a line and the y-intercept of the line, how can you find an equation of the line? • You are given the x-intercept and the y-intercept of a line, how can you find an equation of the line?**WRITE THIS**1) Given slope (m) and y int (b): plug into y = mx + b 2) Given slope (m) and a point (x, y): plug into y = mx + b to find b. Then go to step 1. 3) Given two points (x1,y1) and (x2, y2): First find slope, then go to step 2.**Exit Ticket**9) Write the equation of the line perpendicular to the line y = ½ x + 8 through the point (1, -7) in all 3 forms.**Slope Intercept**m is the slope of the line b is the y-intercept of the line**Example**1) Write the equation of the line that has a slope of 4, and a y-intercept of -2. 2) Write the equation of the line between the points (2, 4) and (4, 12).**Example**3) Write the equation of the line pictured.**Point-Slope**(x1, y1) is a point on the line m is the slope of the line**Examples**• Write the equation of the line that passes through the point (4, -2) and has a slope of 6. 5) Write the equation of the line that passes through the points (1, 8) and (-2, 6).**Standard Form**Where A, B & C are integers A is NOT negative**Putting Equations into Standard Form**1) Put the equation into slope-intercept form. 2) Subtract mx from both sides (EX: y = 3x + 7 becomes –3x + y = 7) 3) If the number in front of x is negative, multiply everything by -1. 4) If the number in front of x is a fraction, multiply everything by the denominator.**Examples**• Write the equation of the line that passes through the points (2, 6) and (3, -3) in standard form. • Write the equation of the line that has slope -5 and passes through the point (1, -4) in standard form. • Write the equation of the line through the points (3, -5) and (7, 1) in standard form.**Pop Quiz**• You are given the slope of a line and a point on the line. How can you find an equation of the line? • You are given the slope of a line and the y-intercept of the line, how can you find an equation of the line? • You are given the x-intercept and the y-intercept of a line, how can you find an equation of the line?