Question

Sales for a company were 6 million dollars more the second year than the first, and sales for the third year were tripled the sales for the second year. If sales for the third year were 24 million dollars, what were sales, in millions of dollars, for the first year?

Answer 1

Sales for the first year were 2 millions of dollars

Further explanation

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 :

m → gradient of the line

( 0 , c ) → y - intercept

Gradient of the line could also be calculated from two arbitrary points on line ( x₁ , y₁ ) and ( x₂ , y₂ ) with the formula :

$\large {\boxed {m = \frac{y_2 - y_1}{x_2 - x_1}}$

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

$\large {\boxed {y - y_1 = m ( x - x_1 )}}$

Let us tackle the problem!

Let:

Sales for the first year = s₁

Sales for the second year = s₂

Sales for the third year = s₃

Given:

s₂ = 6 + s₁

s₃ = 3s₂

s₃ = 24

Unknown:

s₁ = ?

Solution:

$s_3 = 3s_2$

$24 = 3s_2$

$s_2 = 24 \div 3$

$s_2 = 8$

$s_2 = 6 + s_1$

$8 = 6 + s_1$

$s_1 = 8 - 6$

$s_1 = 2$

Conclusion:

Sales for the first year = 2 millions of dollars

Learn more

• Inverse of Function : brainly.com/question/9289171
• Rate of Change : brainly.com/question/11919986
• Graph of Function : brainly.com/question/7829758

Answer details

Grade: High School

Subject: Mathematics

Chapter: Function

Keywords: Function , Trigonometric , Linear , Quadratic

Answer 2

The sales in the first year is $\boxed{2{\text{million of dollars}}}.$

Further explanation:

The linear equation with slope m and intercept c is given as follows.

$\boxed{y = mx + c}$

The standard form of the linear equation can be expressed as follows,

$\boxed{ax + by = c}$

The formula for slope of line with points $\left( {{x_1},{y_1}} \right)$ and $\left( {{x_2},{y_2}} \right)$ can be expressed as,

$\boxed{m = \frac{{{y_2} - {y_1}}}{{{x_2} - {x_1}}}}$

Explanation:

Consider the sale in the first year as $x$.

Consider the sale in the second year as $y$.  

Consider the sale in the third year as $z$.

Sales for a company were 6 million dollars more the second year than the first.

$y = 6 + x$

Sales for the third year were 24 million dollars.

$z = 24$

Sales for the third year were tripled the sales for the second year.

$z = 3y$

Substitute 24 for z in above equation.

$\begin{aligned}24&= 3y\\\frac{{24}}{3} &= y\\8&= y\\\end{aligned}$

Substitute $8$ for $\text{y}$ in equation $y = 6 + x$

$\begin{aligned}8&= 6+ x\\8 - 6&= x\\2&= x\\\end{aligned}$

The sales in the first year is $\boxed{2{\text{million of dollars}}}.$

Learn more:

1. Learn more about inverse of the function brainly.com/question/1632445.
2. Learn more about equation of circle brainly.com/question/1506955.
3. Learn more about range and domain of the function brainly.com/question/3412497

Answer details:

Grade: High School

Subject: Mathematics

Chapter: Linear inequality

Keywords: sales, company, 6 million, dollars, second year, first, sales for second, sales for third year, tripled, first year, 24 million, millions of dollars.