Question
Write the equations of the given lines.
Line 1: y-intercept = 3, slope = 2
Line 2: y-intercept = - 1, slope = -5
Hint:
1. The slope of a line can be defined as the change in y coordinates of any 2 points on that line corresponding to the change in the x coordinates of those 2 points. This is generally referred to as the rise to run ratio of the given line i.e. how much did the y-coordinates rise vis-a-vis how long a distance was covered by the x-coordinates. Slope = m = rise / run = y2-y1 / x2-x1
2. Y-intercept is that point on a line where the line intersects with the y-axis i.e. the point at which x-coordinate is 0.
3. Equation of a line, when its slope and intercept is given can be given as-
y = mx + b, where-
y = y-coordinate
m = slope
x = x-coordinate
b = y-intercept
The correct answer is: 2y + x = 0 is the equation of the line with slope -1/2 and passing through origin.
Step-by-step solution:-
Line 1: y-intercept = b = 3, slope = m = 2
Equation of a line in Slope-intercept form-
y = mx + b
∴ y = 2 × x + 3
∴ y = 2x + 3
Line 2: y-intercept = b = -1, slope = m = -5
Equation of a line in Slope-intercept form-
y = mx + b
∴ y = (-5) × x + (-1)
∴ y = -5x -1
Final Answer:-
∴ y = 2x + 3 and y = -5x - 1 are the equations of the given Line 1 & Line 2, respectively.
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