Question
The height of a sunflower being grown for a botany experiment can be modeled with a linear equation with variables y (height in cm) and x (days after measurements started). The line has slope 2.9. Two weeks after measurements started, the height was 49.1 cm. Use the point-slope form of a line to find the equation. How tall was the sunflower at the first measurement?
m = 2.9 point is (14, 49.1)
y - 49.1 = 2.9(x - 14)
y = 2.9x + 8.5
So....was the sunflower 8.5 cm at the first measurement which would be the first day if I substitute 0 in for x, or, would it be 11.4 cm on day 1 because I have to substitute 1 in for x???
m = 2.9 point is (14, 49.1)
y - 49.1 = 2.9(x - 14)
y = 2.9x + 8.5
So....was the sunflower 8.5 cm at the first measurement which would be the first day if I substitute 0 in for x, or, would it be 11.4 cm on day 1 because I have to substitute 1 in for x???
Answers
R_scott
x in the problem is defined as "(days after measurements started)"
... so the 1st measurement would be zero days after start
... so the 1st measurement would be zero days after start
Anonymous
y=2.9x+49.1; x=14
y=89.7
y=89.7