22(1 + 4 + 9 + 16 +251 + 4 + 9 + 16 + 25 + 3636)
= 87362 units^2
Let the number of blue marbles be x
number of yellow marbles = x/3
number of green = x- 90
ATQ
x + x/3 + x - 90 = 694
2x + x/3 = 784
(6x + x)/3 = 784
7x/3 = 784
x = 784 x 3/7
x = 112 x 3
x = 336
number of blue marbles = 336
yes, they are all proportional
Switch a and f and see if that works
Open this web, the web is really - really helps....................................
http://www.coolmath.com/algebra/08-lines/11-finding-equation-line-point-slope-01