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Find the equation of the line that passes through the points (1, –2) and (4, 7)

Sagot :

Hi Brainly user! I'll answer your question.

First we're going to use the two points and the slope formula to find the slope of the line.

The slope formula is:

[tex]\sf m=\cfrac{y_2-y_1}{x_2-x_1}[/tex]

Substitute the values:

[tex]\sf m=\cfrac{7-(-2)}{4-1}[/tex]

[tex]\sf m=\cfrac{7+2}{3}[/tex]

[tex]\sf m=\cfrac{9}{3}[/tex]

[tex]\sf m=3[/tex]

Now that we know the slope, we are going to use the first point and the point-slope formula to determine the equation.

The point-slope formula is:

  • [tex]\sf y-y_1=m(x-x_1)[/tex]

Substitute the values:

[tex]\sf y-(-2)=3(x-1)[/tex]

[tex]\sf y+2=3(x-1)[/tex]

[tex]\sf y+2=3x-3[/tex]

[tex]\sf y=2x-3-2[/tex]

[tex]\sf y=2x-5[/tex]

Therefore, the line's equation is y = 2x - 5.