Question

You were 20 inches tall at birth, and 65 inches tall on your 10th birthday. Create a linear equation to

represent this situation. According to your equation, how tall will you be at age 20?
show all the workings

Answer 1

`y=4.5t+20\\\\t=20\\y=4.5*20+20\\y=90+20\\y=110`

Explanation:

So when t=0 in the first equation y=20 which is the length as you are just born. How I calculate 4.5 is that I assume:

y=xt+20

for t=10 we have y=65

65=10x+20

10x=45

x=4.5

the equation becomes y=4.5t+20.