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Yuki888 [10]
3 years ago
13

What is the equation of the line that passes through the points (4/5,1/5) and (1/2,3/2)?​

Mathematics
2 answers:
Ber [7]3 years ago
8 0

Answer:

\large\boxed{y=-\dfrac{13}{3}x+\dfrac{11}{3}}-\bold{slope\ intercept\ form}\\\boxed{13x+3y=11}-\bold{standard\ form}

Step-by-step explanation:

The slope-intercept form of an equation of a line:

y=mx+b

<em>m </em><em>- slope</em>

<em>b </em><em>- y-intercept</em>

The formula of a slope:

m=\dfrac{y_2-y_1}{x_2-x_1}

We have two points

\left(\dfrac{4}{5},\ \dfrac{1}{5}\right),\ \left(\dfrac{1}{2},\ \dfrac{3}{2}\right)

Convert fractions to the decimals

<em>(divide the numerator by the denominator) </em>:

\dfrac{4}{5}=0.8,\ \dfrac{1}{5}=0.2,\ \dfrac{1}{2}=0.5,\ \dfrac{3}{2}=1.5

\left(\dfrac{4}{5},\ \dfrac{1}{5}\right)=(0.8,\ 0.2)\\\\\left(\dfrac{1}{2},\ \dfrac{3}{2}\right)=(0.5,\ 1.5)

Calculate the slope:

m=\dfrac{1.5-0.2}{0.5-0.8}=\dfrac{1.3}{-0.3}=-\dfrac{13}{3}

Put the value of slope and the coordinates of the first point to the equation of a line:

0.2=-\dfrac{13}{3}(0.8)+b      <em>multiply both sides by 3</em>

0.6=(-13)(0.8)+3b

0.6=-10.4+3b           <em>add 10.4 to both sides</em>

11=3b           <em>divide both sides by 3</em>

\dfrac{11}{3}=b\to b=\dfrac{11}{3}

Finally:

y=-\dfrac{13}{3}x+\dfrac{11}{3} - slope-intercept form

Convert to the standard form (Ax + By = C):

y=-\dfrac{13}{3}x+\dfrac{11}{3}      <em>multiply both sides by 3</em>

3y=-13x+11          <em>add 13x to both sides</em>

13x+3y=11 - standard form

Setler [38]3 years ago
7 0

Answer:

y-\frac{3}{2}=\frac{-13}{3}(x-\frac{1}{2}) point-slope form

13x+3y=11 (standard form)

Let me know if you prefer another form.

Step-by-step explanation:

The slope of a line can be found using \frac{y_2-y_1}{x_2-x_1} provided you are given two points on the line.

We are.

Now you can use that formula.  But I really love to just line up the points vertically then subtract them vertically then put 2nd difference over 1st difference.

 (4/5  ,  1/5)

-( 1/2  ,  3/2)

-----------------

3/10          -13/10

2nd/1st = \frac{\frac{-13}{10}}{\frac{3}{10}}=\frac{-13}{3} is our slope.

So the following is point-slope form for a linear equaiton:

y-y_1=m(x-x_1) \text{ where } m \text{ is slope and } (x_1,y_1) \text{ is a point on the line }    

Plug in a point (x_1,y_1)=(\frac{1}{2},\frac{3}{2}) \text{ and } m=\frac{-13}{3}.

This gives:

y-\frac{3}{2}=\frac{-13}{3}(x-\frac{1}{2})

I'm going to distribute:

y-\frac{3}{2}=\frac{-13}{3}x-\frac{-13}{6}

Now I don't like these fractions so I'm going to multiply both sides by the least common multiply of 2,3, and 6 which is 6:

6y-9=-26x+13

Add 26x on both sides:

26x+6y-9=13

Add 9 on both sides:

26x+6y=22 This is actually standard form of a line.

It can be simplified though.

Divide both sides by 2:

13x+3y=11 (standard form)

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