Using the first X and Y value replace the values in the equation and see which one works:
1.25 = 0.012(50) + 0.65
0.012(5) = 0.6 +0.65 = 1.25
The first equation works
Now try the second set: of values to check:
1.85 = 0.012(100) +0.65
0.012*100 = 1.20 + 0.65 = 1.85
The first equation is the correct one.
Answer:
y = 0.012x + 0.65
Step-by-step explanation:
In order to confirm which equation gives the cost of y in terms of the number of pages x, each and every equation needs to be checked out.
Assuming y = 1.25 and x = 50 (as given in question)
First Equation:
y = 0.012x + 0.65
y = 0.012(50) + 0.65
y = 0.6 + 0.65
y = 1.25
Second Equation:
y = 0.012x + 1.25
y = 0.012(50) + 1.25
y = 0.6 + 1.25
y = 1.85
Third Equation:
y = 0.012x + 49.985
y = 0.012(50) + 49.985
y = 0.6 + 49.985
y = 55.985
Fourth Equation:
y = 83.3x + 0.65
y = 83.3(50) + 0.65
y = 4165 + 0.65
y = 4165.65
Hence, only the first equation is resulting in the cost y in terms of the number of pages x. Therefore, is the correct one.
