Blake and scarlett spent the same amount of time on each of two days reading an entire i put a picture of the rest of the questionu

We must solve for scarlet's time to find how long blake had taken to read his remaining chapters. The linear equation would be chapters = (rate)*(time) +first day
for Scarlett she has  the equation of 25 = 3x + 10 to find her time
solve for x to find time spent on the second day.
25 = 3x + 10 .  
subtract 10 from both sides
15 = 3x
divide both by 3
5=x .  5 hours were spent by both students on the 2nd day

for blake we have hours but not the rate so we have an equation of
16= y(5) + 6
subtract 6 from both sides
10= 5y
divide both sides by 5
2=y 

Blake's rate was 2 chapters per hour on the second day.