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**Identify and Graph Linear Equations Name and Graph X and Y Intercepts**

Linear Functions Identify and Graph Linear Equations Name and Graph X and Y Intercepts

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**Vocabulary for this lesson**

Linear Equation – the equation of a line whose graph is a straight line. Standard Form – Linear equations written in the form Ax + By + C= 0 X-Intercept – the point where a graphed line crosses the x-axis. Y-Intercept – the point where a graphed line crosses the y-axis.

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**Determine whether each equation is linear…**

Determine whether each equation is linear….if so, write it in Standard Form Can it be written in standard form? Ax + By = C 1) y = 5 – 2x Yes +2x x 2x + y = 5 2) y = -3 – x Yes + x x x + y = -3 3) 2xy – 5y = 6 No Why?....The first term has TWO variables.

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**Another way to look at this.....**

(3) (3) 4) 1/3 y = -1 Yes y = -3 Can it be written in standard form? Ax + By = C 5) 5x + 3y = z + 2 No Why?....It has an extra variable “z”. 6) y = x2 – 8 No Why?....Because the “x” is squared. Another way to look at this..... To be considered LINEAR, an equation must have a degree of ONE.

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**x and y - Intercepts To find the x-intercept, let y = 0**

To find the y-intercept, let x = 0 The x-int. is 7, so the graph intersects the x-axis at (7, 0) The y-int. is -2, so the graph intersects the y-axis at (0, -2)

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**You can also graph using the intercepts.**

x-intercept (7, 0) y-intercept (0, -2) Now, draw a line through the points.

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**Find the x & y intercepts, then graph the equation.**

(-5, 0) (0, -5)

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**Find the x & y intercepts, then graph the equation.**

(3, 0) 0 + 2y = 9 2y = 9 y = 4.5 (0, 4.5)

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**Determine the x & y intercepts of each linear function.**

10) 11) x y -3 -1 -2 1 2 3 y-int. = 3 or (0, 3) x-int. = -4 or (-4, 0) x-int = -2 Or (-2, 0) y-int = 2 Or (0, 2)

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Real World Examples x-int. of 20 means that after 20 minutes, the temperature was 0°F. y-int. of -4 means that at 0 time (the beginning) the temperature was °F x-int. = 20 or (20, 0) 12) Determine the x & y intercepts and describe what the intercepts mean. y-int. = -4 or (0, -4)

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Real World Examples Determine the x & y intercepts and describe what they mean. x-int. = -3 or (-3, 0) y-int. = or (0, 2.25) The x-int. doesn’t make sense here because it is negative. The y-int. represents the base fare, or cost at zero miles.

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**Determine the Intercepts and explain each.**

14) Draining a pool 15) Position of a scuba diver. Time (h) Volume (g) 10,080 2 8640 4 7200 6 5760 8 4320 10 2880 14 The x-int. shows that after 12 sec., the diver was at the surface (0 m). The y-int. shows that when he started (0 s) he was at -24m or 24m below sea level. Time (s) Depth (m) -24 3 -18 6 -12 9 -6 12 The x-int. shows that after 14 hours, the pool had 0 gallons, or it was completely drained. The y-int. shows that at 0 hours, when they began, it had 10,080 gallons in it.

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Exercise

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Challenge

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