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dsp73
2 years ago
5

Write an equation of line that passes through the points (4,3) land (1, 2) in point-slope form.

Mathematics
1 answer:
ivann1987 [24]2 years ago
8 0

Answer:

y=\frac{1}{3} x+\frac{5}{3}

Step-by-step explanation:

Use the slope formula to find the slope:

\frac{y_{2}-y_{1}}{x_{2}-x_{1}}=\frac{rise}{run}

Insert the values:

(4_{x_{1}},3_{y_{1}})\\\\(1_{x_{2}},2_{y_{2}})\\\\\frac{2-3}{1-4}=\frac{-1}{-3}=\frac{1}{3}

The slope is 1/3.

You can do this two ways. You can solve using slope-intercept and solve for b, <em>or</em>  use point-slope form, then simplify to slope-intercept

Use the slope-intercept form:

y=mx+b

where:

  • m is the slope
  • b is the y-intercept
  • x and y are corresponding coordinate points (x,y)

Insert the slope and one of the given coordinate points:

(1_{x},2_{y})\\\\2=\frac{1}{3} (1)+b

Solve for the y-intercept. Simplify:

2=\frac{1}{3} +b

Subtract 1/3 from both sides:

2-\frac{1}{3} =\frac{1}{3} -\frac{1}{3} +b\\\\2-\frac{1}{3} =b

Subtract. Find the common denominator:

\frac{6}{3} -\frac{1}{3} =\frac{5}{3}

Insert:

\frac{5}{3} =b

The y-intercept is 5/3. Insert:

y=\frac{1}{3}x+\frac{5}{3}

<em>or</em>

<em></em>

Use point-slope form:

y-y_{1}=m(x-x_{1})

where:

  • m is the slope
  • x1 and y1 are corresponding coordinate points

Insert values:

(1_{x_{1}},2_{y_{1}})\\\\y-2=\frac{1}{3} (x-1)

Simplify the equation by solving for y. This will result in the slope-intercept form. Simplify multiplication using the rule \frac{a}{b}  *c=\frac{ac}{b}:

y-2=\frac{1(x-1)}{3} \\\\y-2=\frac{x-1}{3}

Isolate the variable. Add 2 to both sides:

y-2+2=\frac{x-1}{3} +2\\\\y=\frac{x-1}{3}+2

Simplify to slope-intercept form, y=mx+b. Use the rule \frac{a-b}{c} =\frac{a}{c}-\frac{b}{c}:

y=\frac{x}{3} -\frac{1}{3} +2

Combine like terms. Find a common denominator:

-\frac{1}{3}+2=-\frac{1}{3}+\frac{2}{1}\\\\-\frac{1}{3}+\frac{3*2}{3*1}=-\frac{1}{3}+\frac{6}{3}  \\\\-\frac{1}{3}+\frac{6}{3} =\frac{5}{3}

Insert:

y=\frac{x}{3} +\frac{5}{3}

Use the rule \frac{x}{a} =\frac{1}{a}x:

y=\frac{1}{3} x+\frac{5}{3}

:Done

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