Use an equation of ratios to solve this:
12 cm 9 cm
---------- = ---------
x 8 cm
Cross multiplying, 9x = 96, and x = 32/3 cm (10 2/3 cm).
(I'm not 100% sure this is accurate)
I got 4m/-4n.
Y = -2x+3 is the function which satisfies the values of x and y.
65,000 really easy once you know