Sales for the first year were 2 millions of dollars
<h3>Further explanation</h3>
Solving linear equation mean calculating the unknown variable from the equation.
Let the linear equation : y = mx + c
If we draw the above equation on Cartesian Coordinates , it will be a straight line with :
<em>m → gradient of the line</em>
<em>( 0 , c ) → y - intercept</em>
Gradient of the line could also be calculated from two arbitrary points on line ( x₁ , y₁ ) and ( x₂ , y₂ ) with the formula :

If point ( x₁ , y₁ ) is on the line with gradient m , the equation of the line will be :

<em>Let us tackle the problem!</em>
Let:
<em>Sales for the first year = s₁</em>
<em>Sales for the second year = s₂</em>
<em>Sales for the third year = s₃</em>
<u>Given:</u>
s₂ = 6 + s₁
s₃ = 3s₂
s₃ = 24
<u>Unknown:</u>
s₁ = ?
<u>Solution:</u>








<h2>Conclusion:</h2>
<em>Sales for the first year = </em><em>2 millions of dollars</em>
<h3 /><h3>Learn more</h3>
<h3>Answer details</h3>
Grade: High School
Subject: Mathematics
Chapter: Function
Keywords: Function , Trigonometric , Linear , Quadratic