Plant A is 6 cm tall and growing at a rate of 4 cm/day Plant B is 10 cm tall and growing at a rate of 2 cm/day Find when the height of each plant will be the

Question

I need help with this problem for my homework at school

Answer 1

Mark's answer is correct, and I am going to expand his solution and explain it to you:

Assume they will be the same height when both reach H cm.

Since plant A is 6 cm and grows 4 cm/day, then it will reach H cm with the given equation

H=6+4d

similarly for plant be the initial height is 10 cm, and it grows 2 cm/day, then

H=10+2d

 

And Mark has the rest for you.

Answer 2

6 + 4d = 10 + 2d

 

Can you solve for d and answer?