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Write an equation in standard form of the line that contains the point (-2,4) and is parallel to (has the same slope as) the line y = 8x-3.

User Gashu
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1 Answer

5 votes

Answer:

The equation of the line in standard form is -8x + y = 20

Explanation:

The standard form of the linear equation is Ax + By = C, where

  • A, B, and C are integers

The slope-intercept form of the linear equation is y = m x + b, where

  • m is the slope
  • b is the y-intercept

Parallel lines have equal slopes

∵ The line is parallel to the line y = 8x - 2

→ Compare it with the slope-intercept form above

m = 8

∵ The parallel lines have the same slopes

The slope of the line = 8

→ Substitute it in the slope-intercept form above

y = 8x + b

∵ The line passes through the point (-2, 4)

x = -2 and y = 4

→ Substitute x by -2 and y by 4 in the equation to find b

∵ 4 = 8(-2) + b

∴ 4 = -16 + b

→ Add 16 to both sides

∴ 4 + 16 = -16 + 16 + b

20 = b

→ Substitute the value of b in the equation above

y = 8x + 20

→ Subtract both sides by 8x

∵ y - 8x = 8x - 8x + 20

∴ y - 8x = 20

→ Switch x and y

-8x + y = 20

The equation of the line in standard form is -8x + y = 20

User Mehrzad Chehraz
by
5.6k points