So if the shapes are similar, they have to have a number multiple from to get the other triangle. If you divide 63 by 42, you get 1.5. Then you have to divide 54 by 1.5 to get G and that would be 36.
The tangent of the angle is
... tan(α) = ay/ax = -8.6/6.1
Then the angle (measured CCW from +x) is
... α = arctan(-86/61) ≈ 305°
Answer:
The equation of the line that passes through the points
(1,-6) and (-4,9)
is
y=-3x-3
You can just do the inverse operation. 39 divied by 10 = 3.9
so 3.9 *10 =39
hope it helped