Answer:
The equation of the straight line is [tex]y=3x+6[/tex]
Step-by-step explanation:
Any straight line passing through points [tex](a_1,b_1)[/tex] and [tex](a_2,b_2)[/tex] is given by:
[tex]y-b_1=m(x-a_1)[/tex] where m is defined as the slope of the line:
[tex]m=\frac{b_2-b_1}{a_2-a_1}[/tex]
In the given question
[tex]m=\frac{9-3}{1-(-1)} =3[/tex]
Substituting the values we get:
Reference: https://www.cuemath.com/geometry/equation-of-a-straight-line/
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