The rubber tree starts off at 95 in and increases 4in per year. We can write this as 95 + 4y (y representing the number of years) the cactus tree starts off at 40 in and increases 5 in per year so we can write is as 40 + 5y. We want to find out y when the cactus is taller so 95+4y < 40+5y And we solve for y Subtract 40 from both sides 55+4y < 5y Subtract 4y from both sides 55 < y Y is any number over 55 but we need the year when the cactus will be taller So in 56 years the cactus will be taller.
