Answer:
Step-by-step explanation:
x = days, y = minutes
first day, she walked for 10 minutes......(1,10)
2nd day, she walked for 15 minutes.....(2,15)
now, we find the slope...
(1,10) , (2,15)
slope = (y2 - y1) / (x2 - x1) = (15 - 10) / (2 - 1) = 5/1 = 5
now we use y = mx + b.....we are looking for b, the y int
y = mx + b
slope(m) = 5
u can use either set of points...(1,10)...x = 1 and y = 10
now we sub and find b
10 = 5(1) + b
10 = 5 + b
10 - 5 = b
5 = b
so this equation is y = 5x + 5
so to calculate the number of minutes she walked on day 20, sub in 20 for x and solve for y
y = 5x + 5
y = 5(20) + 5
y = 100 + 5
y = 105 <=== she walked for 105 minutes
