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Linear Equations as Rate of Change. 3.5. Function. Think of y= mx+b as a machine. You put a number in the machine, and it gives you a new number out. This is called a function. X is always the input Y is always the output. Example. y=10+2x. You try. Complete the table below. y=20-x.
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Function • Think of y=mx+b as a machine. You put a number in the machine, and it gives you a new number out. This is called a function
X is always the input • Y is always the output
Example y=10+2x
You try • Complete the table below. • y=20-x
Slope is the rate of change • Slope is how fast the function is changing. • Example: if you are driving, your speed would be the slope.
Example • What is the rate of change? • What is the output when the input is 0? Answer: slope = 3 Output is 4 when input is 0.
“Ms.Farley, when would we ever use this!?” • It is one thing to be able to plug numbers into an equation. It is another thing to use an equation in a real problem. That’s what we are going to practice now. • WARNING: this requires you to THINK. Get ready.