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Sagot :
Answer:
- a) y = 4x - 2
- b) y = 3x + 2
- c) y = 2x - 6
Step-by-step explanation:
a)
The slope as per two ordered pairs (-2, -10), (0, -2)
- m = (-2 - (-10))/(0 - (-2)) = 8/2 = 4
The y-intercept is -2
The equation for this function:
- y = 4x - 2
b)
The slope is
- m = 3
The line passes through (1, 5)
The line is:
- y - 5 = 3( x - 1) in point-slope form
- y = 3x +2 in slope-intercept form
c)
The slope as per points on the graph (3, 0), (4, 2)
- m = (2 - 0)/(4 - 3) = 2
The line in point slope form using point (3, 0):
- y = 2(x - 3)
The line in slope-intercept form:
- y = 2x - 6
a) substitute m = 4 and c = - 2 into the slope intercept equation, thus, the equation of the line is y = 4x - 2
The answer is y = 4x - 2
b) Let's begin by listing out the given information:
The line has a slope of 3
The equation of the line becomes:
[tex]y = mx + b \\ m = 3 \\ y = 3x + b[/tex]
The line passes through point (1, 5).
We will obtain the equation using the point-slope formula, we have:
[tex]y - y1 = m(x - x1) \\ (x1 \: y1) = (1 \: 5) \\ y - 5 = 3(x - 1) \\ y - 5 = 3x - 3 \\ y = 3x - 3 + 5 \\ y = 3x + 2[/tex]
Therefore, the equation of the straight line is y = 3x + 2
c) we use that point and the slope to replace in the expression:
[tex]y - y1 = m(x - x1)[/tex]
That is:
[tex]y - 0 = 2(x - 3) \: \: y = 2x - 6[/tex]
y = 2x - 6 is the answer
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