Answer:
C = 1200x + 450
Step-by-step explanation:
C = 30y + 15... (1)
y = 40x + 25... (2)
Substituting y = 40x + 25 in equation (1)
C = 30(40x + 25) + 15
C = 30*40x + 30*15
The room temperature is 25 degrees Celsius.
[40 × 2] - [6 × 11]
[80]-[66]
80-66
=14
x^2 = 16
x = ±4
x^2 = -16
x = -
as a negative number cannot be squareroot
