Combine like terms. what is a simpler form of the expression?

-3(-4y + 3) + 7y

a.
19y - 9
b.
10y
c.
-19y + 3

The correct answer is A. 19y-9
-3*-4y=12y
-3*3=-9
12y-9+7y=19y-9

Point slope form of the equation can be written as follows
y - y₁ = m (x - x₁)
y and x are the 2 variables , m is the slope and x₁ and y₁ are the respective coordinates for the given point
in this format a point of a line and the slope of the line are given. using this information we can write down the point - slope formula for the graph
since a point has been given we know the x₁ and y₁ coordinates.
These are the coordinates of the given point (-1,6)
x₁ = -1
y₁ = 6
slope has been given as -3, m = -3
substituting these values in the formula, 
y - y₁ = m (x - x₁)
y - 6 = -3 (x - (-1))
y - 6 = -3 (x + 1)
answer is B.