The average weight of a male child's brain is 970 grams at age 1 and 1270 grams at age 3.(a) Assuming that the relationship between brain weight y grams and age t years is linear, write a linear model for the data?(b) What is the slope?What does it tell you about brain weight?The weight of a male human brain is decreasing by m grams/year.A human male's brain reaches a maximum weight at age 3.At birth, a human brain weighs 970 grams.A human male's brain weight is constant for his entire lifespan.The weight of a male human brain is increasing by m grams/year.(c) Use your model to estimate the average brain weight at age 2.(d) Use your school's library, the Internet, or some other reference source to find the actual average brain weight at age 2