Directions: Show all necessary steps and calculations for the problem below. As usual, do not be
shy in using language to explain your solution.
Scientific Articles An important indicator of the
innovation and the health of a country’s economy is the
publication of articles in scholarly journals. These
articles are often followed by patents and new products.
Based on data from the National Science
Foundation, the following equations can be used:
(1) United States $\,\,\,\,y = 200$
(2) Europe $\,\,\,\,\,\,\,\,\,\,\, y = 6.8x + 160$
where $x$ is the number of years since 1990 and $y$ is the
number of publications in thousands.
a. Solve this system of equations.
b. Interpret the meaning of this solution.