Answer
a) 2003
b) No. There might have been a drastic change in the amount of wind power between 1989 and 2000.
c) No. The slope of the line is $.11$, and with a positive y-intercept, the line will not go below the x-axis.
d) More money could be spent on increasing the energy produced by wind power than on geothermal power.
Work Step by Step
geothermal (from 2000-2009, where $x$ is years after 2000): $y-.11x=14.05$
wind power (from 2000-2009, where $x$ is years after 2000): $5.13x-y=.65$
a) Please see the screenshot with the matrix work to solve the matrix. Since the value for $x$ is a decimal, the value was rounded to the nearest whole number.
b)
$5.13x-y=.65$
$5.13(-11)-2.1=.65$
$-56.43-2.1=.65$
$-58.53\ne.65$
c)
$y-.11x=14.05$
$y=.11x+14.05$
