If l is parallel to m, find the values of x and y.

x = 8 and y = 21

Step-by-step explanation:

Alternate interior angles are equal.  Therefore, 7x + 12 = 12x - 28

12 = 5x - 28

5x = 40

x = 8

Now, supplementary angles have a sum of 180.  Therefore, 12x - 28 + 9y - 77 = 180

Substitute 8 in for x and 12(8) + 12 + 9y - 77 = 180

96 - 28 - 77 + 9y = 180

9y - 9  = 180

9y = 189

y = 21

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

1/800 is the right answer