Answer:
3
Step-by-step explanation:
First you gotta take the equation and bring it to the following form:

The slope of the line is the coefficient of x, a.
In other words:

So, as we can see, the number infront of x is 3. That is to say that the slope of this line is equal to 3.
The y intercept is going to be 10x
Answer:
The proposition is true.
Step-by-step explanation:
Now we proceed to demostrate that expression given is true by algebraic means:
1)
Given
2)

3)
Distributive property/
4)
Commutative, associative and modulative properties/Existence of additive inverse/
5)
Commutative property/Definition of division
6)

7)
Distributive property/Associative property/
8)
Modulative property/Existence of additive inverse/
9)
Distributive property
10)

11)
Commutative property/Definition of division/Result
Answer:
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