Question #d842e

2 Answers
Jan 24, 2017

(y + color(red)(1)) = color(blue)(2/3)(x - color(red)(3))

Or converting to the slope-intercept form:

y = 2/3x - 3

Explanation:

First, we need to find the slope of the equation given in the problem by converting it to the familiar slope-intercept form by solving for y:

2x - color(red)(2x) - 3y = -color(red)(2x) + 8

0 - 3y = -2x + 8

-3y = -2x + 8

(-3y)/color(red)(-3) = (-2x + 8)/color(red)(-3)

(color(red)(cancel(color(black)(-3)))y)/cancel(color(red)(-3)) = 2/3x - 8/3

y = 2/3x - 8/3

The slope-intercept form of a linear equation is:

y = color(red)(m)x + color(blue)(b)

Where color(red)(m) is the slope and color(blue)(b) is the y-intercept value.

Therefore we know the slope of this line and a line parallel to this line is color(red)(m = 2/3)

We can now use this slope and the point and the point-slope formula to find an equation for the line requested in the problem:

The point-slope formula states: (y - color(red)(y_1)) = color(blue)(m)(x - color(red)(x_1))

Where color(blue)(m) is the slope and color(red)(((x_1, y_1))) is a point the line passes through.

Substituting the values from the problem and the calculate gives:

(y - color(red)(-1)) = color(blue)(2/3)(x - color(red)(3))

(y + color(red)(1)) = color(blue)(2/3)(x - color(red)(3))

Or converting to the slope-intercept form:

y + color(red)(1) = 2/3x - (2/3 xx color(red)(3))

y + 1 = 2/3x - 2

y + 1 - 1 = 2/3x - 2 - 1

y = 2/3x - 3

Jan 24, 2017

2x-3y=9

Explanation:

2x-3y=8
we change to y=mx+c, where m=gradient.

2x-8=3y
y=(2x-8)/3
y=2/3x-8/3

since it is a parallel line, they have a same value of gradient,where m=2/3.

use y-y_1=m(x-x_1)
y-(-1)=2/3(x-3)
y+1=2/3x-2
y=2/3x-2-1
y=2/3x-3
3y=2x-9
9=2x-3y