Answer: old McDonald has 54 chickens and 2 cows.
Step-by-step explanation:
Let x represent the number of chickens that old McDonald have.
Let y represent the number of cows that old McDonald have.
He counted 56 heads. A chicken and a cow has one head each. It means that
x + y = 56
He counted 116 legs. A chicken has 2 legs and a cow has 4 legs. It means that
2x + 4y = 116 - - - - - - - - -1
Substituting x = 56 - y into equation 1, it becomes
2(56 - y) + 4y = 116
112 - 2y + 4y = 116
- 2y + 4y = 116 - 112
2y = 4
y = 4/2 = 2
x = 56 - y = 56 - 2
x = 54
Given a function f(x), the value of x is the x-coordinate on the x-axis. Therefore, if we wanted to find f(3) given the graph of f(x), we look for the point on the graph where x = 3, then find its y-value. That y-value is the answer to f(3).
This also applies for any other value of x.
There's is one gallon of gas left in the tank or gas can
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