Given f(x) = –2x+5 find f'(x).
1 answer:
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Answer:
a. The slope of EK is
b. The equation of line EK is y = x -
Step-by-step explanation:
The form of the equation of a line is y = m x + b, where
- m is the slope of the line
- b is the y-intercept
The rule of the slope is m = , where
- (x1, y1) and (x2, y2) are two points on the line
- The rule of the mid-point is (
)
∵ BECK is a rhombus
∵ The diagonal is the line that joins two opposite vertices
∵ B and C are opposite vertices in the rhombus
∵ E and K are opposite vertices in the rhombus
∴ BC and EK are the diagonals of the rhombus BECK
∵ The diagonals of the rhombus are ⊥ and bisect each other
∴ EK is ⊥ bisector to BC
→ Let us find the slope and the mid-point of BC
∵ B = (3, 5) and C = (7, -3)
∴ x1 = 3 and y1 = 5
∴ x2 = 7 and y2 = -3
→ Substitute them in the rule of the slope above to find it
∵ m = =
= -2
∴ m = -2
∴ The slope of BC = -2
→ To find the slope of EK reciprocal the slope of BC and change its sign
∴ m⊥ =
∴ The slope of EK =
a. The slope of EK is
→ Substitute the value of the slope in the form of the equation above
∵ y = x + b
→ To find b substitute x and y in the equation by the coordinates
of a point on the line
∵ The mid-point of BC is the mid-point of EK
∵ The mid-point of BC = () = (
) = (5, 1)
∴ The mid-point of EK = (5, 1)
→ Substitute x by 5 and y by 2 in the equation
∵ 1 = (5) + b
∴ 1 = + b
→ Subtract from both sides
∴ = b
→ Substitute the value of b in the equation
∵ y = x +
∴ y = x -
b. The equation of line EK is y = x -
