Pg. 44-45 Y-Intercept from Equations

Pg. 44-45 Y-Intercept from Equations

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Y-Intercept from Slope Intercept form

-The y-intercept is the number after x that is by itself...it doesn't have a variable.

-For example if the equations is y=2x+3, then the y-intercept is 3.

-In y=8, the y-intercept is 8 because it doesn't have a variable.

-In y=5x, the y-intercept is 0 because there is not a number after the variable.

Multiple Choice

Practice A: y= - 5/4x + 2

• -5/4

• 2

• 0

• none

Multiple Choice

Practice B: y = 12

• none

• 0

• 12

Y-Intercept from Standard Form Equations

• Take the number after the equal sign (without a variable) and place it above whatever number is attached to the y.

• For example: 3x - y = -6

• Rewrite as 3x - 1y = -6

• b = -6/-1 = 6

Multiple Choice

Practice C: 2x - y = 4

• none

• 0

• 4

• -4

Multiple Choice

Question 1: y = 3x - 5

• none

• 0

• 3

• -5

Multiple Choice

Question 2: y = -3

• none

• 0

• -3

• -5

Multiple Choice

Question 3: 2x + 3y = 6

• none

• 0

• 2

• 1/2

Multiple Choice

Question 4: y = -x + 2

• none

• 0

• 2

• -1

Multiple Choice

Question 5: y = -4

• none

• 0

• 2

• -4

Multiple Choice

Question 6: x - y = 1

• none

• 0

• -1

• 1

Multiple Choice

Question 7: y = -3/5x + 4

• none

• 0

• -3/5

• 4

Multiple Choice

Question 8: y = -1

• none

• 0

• -1

• 4

Multiple Choice

Question 9: 2x + 5y = 10

• none

• 0

• 2

• 5

Multiple Choice

Question 10: y = -8x - 3

• none

• 0

• -8

• -3

Multiple Choice

Question 11: y = 2

• none

• 0

• 2

• -3

Multiple Choice

Question 12: x + 2y = -2

• none

• 0

• -1

• -2

Multiple Choice

Question 13: 10x - 3y = -15

• none

• 0

• -3/2

• 5

Multiple Choice

Question 14: y = 1/2x -1

• none

• 0

• 1/2

• -1

Multiple Choice

Question 15: x = -2 (Is there a number for y to equal? Nope. There is none)

• none

• 0

• -2

• 1

Multiple Choice

Question 16: x = 4 (Is there a number for y to equal? Nope. There is none)

• none

• 0

• 4

• 1

Multiple Choice

Question 17: x - y = 3

• none

• 0

• 3

• -3

Multiple Choice

Question 18: y = 2/5x - 2

• none

• 0

• 2/5

• -2

Multiple Choice

Question 19: y = 2x + 2

• none

• 0

• 2

• -2

Multiple Choice

Question 20: 3x + 2y = -2

• none

• 0

• -1

• -2/3

Multiple Choice

Question 21: y = 16

• none

• 0

• 1

• 16

Multiple Choice

Question 22: y = 5/4x

• none

• 0

• 1

• 5/4

Multiple Choice

Question 23: 4x - 5y = 15

• none

• 0

• -3

• 15/4

Multiple Choice

Question 24: x = 3

• none

• 0

• 3

• 1

Multiple Choice

Question 25: y = 3

• none

• 0

• 3

• 1