Renata moved to her new home a few years ago. back then, the young oak tree in her back yard was 190 centimeters tall. she measured it once a year and found that it grew at a constant rate. 3 years after she moved into the house, the tree was 274 centimeters tall. many years passed from the time renata moved in until the tree was 344 centimeters tall?

274 - 190 = 84so it took 3 years to grow 84 inches...that means it is growing at a rate of : 84/3 = 28 cm per year

y = 28x + 190...this would be ur equation where y is the total height in cm. and x is the number of years. 

So how many years till it reaches 344 cmsub in 344 for y and solve for x

344 = 28x + 190
344 - 190 = 28x
154 = 28x
154/28 = x
5.5 = x <=== 5 1/2 (or 5.5) years would have passed