2y=8x-6
y = 4x -3 slope , m , = 4 perpindicular slope = - 1/m = -1/4
y = -1/4 x + b sub in the given point
3 = -1/4 (-3) + b to find b = 2 1/4
y = - 1/4 x + 2 1/4
x = original amount
spending 1/5 leaves 4/5
(x-390) * 4/5 = 3/7 x solve for 'x'
2+10+50+250+1250+ 6250+31250=.........
area = pi r^2
100pi = pi r^2
r^2 = 100
r = 10
(4,-3)
x = number of lights s = small tree lights L = large tree = s+16
1/3 x = 12 s or s = 1/36 x (now there are 2/3 x lights left)
and
(2/3x) 3/4 = 10 (s+16) sub in the green equation for s
1/2 x = 10(1/36 x + 16)
x = 720 lights
x = original count of marbles
losing 2/7ths means he has 5/7 ths of original left
5/7 x - 48 = 1/3 x
x = 126
at the end he has 1/3 of the original amount = 42 marbles
3 3 3 3 + 5 5 5 5 5 5
b/g = 5/4
b = 5/4 g
= 5/4(60) = 75 boys
Appears so...... !
100 c 3 = 100!/(97!3!) = 161 700 ways
