Y=mx+b
m=slope
given
y=6x-9
m=6
the slope is 6
If i understood the question right, you're trying to find the value when h = -2. If that's true so here is how it's done:

Answer:
Your answer is 116
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Above step we use "Multiplication property of equality"

In the above step we "Simplify on both sides of equation"

In the above step we use "Distribution property"

The above step is the result of using "Subtraction property of equality"

Above step is result of "Combining the like terms"

Above step is the result of using "Division property of equality"

Above step is result of "Simplifying fractions on either side of equation"
Answer:
x = 3
Step-by-step explanation: