Product is multiplying. when you multiply a letter with a number you don't put any symbols so it would be 8c
7. -8/3
8. 4/35
9. -21/50
10. 35/64
11.-25/54
Here are a few reasons:
The triangles have the same three sides
The triangles have the same three angles
The triangles could perfect overlap one another
They have corresponding angles.
Not sure if this helped but I hope so!
Switch the x and the y and solve for y
eg inverse of 2y= 3x+1
swith x and y
2x=3y+1
now solve for y
y =(2x-1)/3