Review Is y = 3x a direct variation. If so, what’s the constant and what’s the slope? X and y vary directly. Write an equation that relates x and y. X.

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Presentation transcript:

review Is y = 3x a direct variation. If so, what’s the constant and what’s the slope? X and y vary directly. Write an equation that relates x and y. X = 3, y = 27

4.6 Slope intercept

Notes Slope intercept form: y = mx + b M = slope B = y-intercept Parallel: 2 lines in the same plane that don’t intersect If 2 lines are parallel, they have the SAME slope.

Write in slope intercept form then identify the slope and y-int. t/st Y = -x + 2 2x – 4y = 16 Y = 𝑥+3 2 Y = -4

Graph Y = -x + 1 3x – 2y = 6 Y = 4x

Graph Y = -3x 2x – 5y = 15 Y = 2x + 3

Decide if the equations are parallel Y = x + 3, y = 6 + x 2x + y = 3, 2x + y – 14 = 0

Decide if the equations are parallel 3x + 2y = 1, -2y = 3x - 2 Y = 3x – 2, y = 1/2x + 4

Wrap up Questions/Comments Hw: text pg. 244, #’s: 14-54 evens, 62, 63