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Write an equation of the line that passes through the point (-1,3) and is parallel to...

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jlyon23 | Student, Grade 10 | eNotes Newbie

Posted October 21, 2013 at 9:46 PM via web

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Write an equation of the line that passes through the point (-1,3) and is parallel to the line y=2x+1. ``

I keep getting 2x-1/3 but my teacher said that was wrong.

Tagged with algebra 2, math

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baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted October 21, 2013 at 9:56 PM (Answer #1)

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The equation of a line that is parallel to `y = 2x + 1` must have the same slope.  Since `y=2x + 1` is written in slope-intercept form `(y=mx+b)` the slope (m) is 2.

To pass through the point (-1,3) we can use the point slope form for the equation of the line.

Point-slope form: `y - y_(1)= m(x - x_1)`

This gives us the equation: `y - 3 = 2(x - (-1))`

`y - 3 = 2(x+1)`

`y - 3 = 2x + 2`

`y = 2x + 5`

The solution is y = 2x + 5.

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