Mathematics
Find the equation of a line, which has the y-intercept 4, and is parallel to the line 2x - 3y - 7 = 0. Find the coordinates of the point where it cuts the x-axis.
Straight Line Eq
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Answer
Given equation of line,
⇒ 2x - 3y - 7 = 0,
Converting it in the form y = mx + c,
⇒ 3y = 2x - 7
⇒ y = .
Comparing with y = mx + c, slope = .
Since,the other line is parallel so, its slope will also be equal to . Given, y-intercept is 4 or c = 4.
Putting values of slope and y-intercept in y = mx + c, we will get the equation of line as,
⇒ y =
⇒ y =
⇒ 3y = 2x + 12
⇒ 2x - 3y + 12 = 0.
At the point where the line intersects the x-axis, the y-coordinate there will be zero. So, putting y = 0 in 2x - 3y + 12 = 0.
⇒ 2x - 3(0) + 12 = 0
⇒ 2x = -12
⇒ x = -6.
∴ Coordinates = (-6, 0).
Hence, the equation of the line is 2x - 3y + 12 = 0 and it intersects the x-axis at (-6, 0).
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