Answer:
Part 1) An equation is 15.7=3x+1
Part 2) The approximate population in 1950 was 4.9 million people
Step-by-step explanation:
Let
x -----> the population in 1950 in million people
y -----> the population in 2003 in million people
we know that
y=3x+1 -----> equation A
y=15.7 ----> equation B
substitute equation B in equation A and solve for x
15.7=3x+1
3x=15.7-1
3x=14.7
x=4.9
therefore
The approximate population in 1950 was 4.9 million people