Answer:
at 5 weeks
Explanation:
y = 3x + 40 (David)
y = 6x + 25 (Perla)
since both equal 'y' we can set the expressions equal and solve for 'x'
3x + 40 = 6x + 25
subtract 3x from each side to get:
40 = 3x + 25
subtract 25 from each side to get:
15 = 3x
15/3 = x
5 = x