Skip to content

Help Zone

Student Question

Secondary III • 2yr.


I am not able to find the equation of the line which goes through the following points: (-4.7) and (22.4)

Can you help me?


{t c="richEditor.description.title"} {t c="richEditor.description.paragraphMenu"} {t c="richEditor.description.inlineMenu"} {t c="richEditor.description.embed"}

Explanations (1)

  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

    Team Alloprof • 2yr.


    First of all, as we know that it is a straight line, we know the equation will take the form y = ax + b.

    To find a, the slope of the line, there is a formula:

    $$a = \frac {y_2 − y_1}{x_2 − x_1} $$

    By entering the values, you will have:

    $$a = \frac {4 − 7}{22 - - 4} = \frac {-3} {26} $$

    By replacing the a by its value in the formula you get this:

    $$ y = − \frac{3}{26}x + b $$

    Then you replace x and y by one of the two points that you have and as there is only the b left as a variable you will be able to find its value by isolating it !

    Feel free to ask us more questions if you have any!

Ask a question