Answer
a) (3, 752)
b) In 2000 (3 years after 1997), 752 daily morning papers and 752 daily evening papers were still in existence.
c) 752 papers of each type (daily morning paper and daily evening paper)
Work Step by Step
$146x-10y=-7086$
$111x+5y=4058$
$111x+5y=4058$
$2*(111x+5y=4058)$
$222x+10y=8116$
$146x-10y=-7086$
$222x+10y=8116$
$222x+10y+(146x-10y)=8116-7086$
$368x=1030$
$368x/368 = 1030/368$
$x=2.799$
$x=3$
$x=3$
$146x-10y=-7086$
$146*3-10y=-7086$
$438-10y=-7086$
$438 = 10y-7086$
$7524 = 10y$
$7524/10 = 10y/10$
$752.4 = y$
$y=752$