Answer:
ii.
Step-by-step explanation:
15. 
Step 1: Distribute the subtraction sign to all the numbers in the second set of parentheses...


Step 2: Combine like terms (
's go with
's)




Step 3: Combine like terms (
's go with
's)




Step 4: Combine like terms (normal numbers go with normal numbers)

1 + 2
3

You were correct!
16. 
I don't really know how to explain this one but I got: (7m-6n)(7m-6n)
Answer:
The equation of any straight line, called a linear equation, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept. The y-intercept of this line is the value of y at the point where the line crosses the y axis.
Here, first we need to calculate the slope of the line,
Here, Coordinates = (4, 6) (-1, -4)
m = y2 - y1 / x2-x1
m = 6 + 4 / 4 + 1
m = 10/5
m = 2
Now, Take first coordinate: y - 6 = 2 (x - 4)
Second coordinate: y + 4 = 2 (x + 1)
In short, Your Answers would be Option B & D
Hope this helps!