d = days passed
y = pages read
Andrew right now is on page 50, so we can say that his equation looks like => y = 50. He's planning to read 10 pages per day, so, let's make a quick table for that
days pages
1 50 + 10(1)
2 50 + 10(2)
3 50 + 10(3)
4 50 + 10(4)
5 50 + 10(5)
d 50 + 10(d )
namely y = 50 + 10d.
Holly hasn't started to read yet, so her equation looks like => y = 0, but she'll be reading faster than Andrew, she'll be doing 20 pages a day, let's make another table
days pages
1 0+20(1)
2 0+20(2)
3 0+20(3)
4 0+20(4)
5 0+20(5)
d 0+20(d )
or just pretty much y = 20d.
bearing in mind that, on a system of equations, the solution is where the graphs meet, or intersect, check the picture below.
