Answer:
y = -3
Step-by-step explanation:
9x + 7y = -12
9(1) + 7y = -12
9 + 7y = -12
7y = -12 - 9
7y = -21 (divide both sides by 7)
y = -3
<span><span>1.
</span>Johann walked 1.2 feet every second.
Find the total feet that Johann walked for 5 seconds.
First, let’s have the given numbers:
=> 1.2 feet
=> 5 second
he walked 1.2 feet in every 1 second. So simply multiply 1.2 x 5 seconds to get
the total feet that Johann walks.
=> 1.2 feet x 5 seconds
=> 6, Thus, Johan walked 6 feet in 5
seconds.
Unit Rate = 1.2 / ft
Unit rate = 6 feet / 5 seconds</span>
The derivative is the rate of change of a function, basically represents the slope at different points. To find the derivative of the given function you can use the power rule, which means, if n is a real number, d/dx(x^n)= nx^(n-1). This is a simplification of the chain rule based on the fact that d/dx(x)=1. Anyway, this means that d/dx(x^3 + 1)= 3x^2. Here n is 3 and so it is 3*x^(3-1)= 3x^2. The derivative of x^3+1 is 3x^2.
If you are wondering what happened to the 1, for any constant C, d/dx(C)=0.