Answer:
(-1, -5)
Step-by-step explanation:

1. We must calculate x, for that we must substitute y, so we have:
5x=9x+4
2. Now we solve the equation.
5x-9x=4
-4x=4
x=-1
3. Now we must calculate y
y=5x
y=5(-1)
y=-5
And the answer is (-1, -5)
Area of a triangle = 1/2 x base x height.
Replace are and base to get:
82.5 = 1/2 x 15 x height
Multiply both sides by 2:
165 = 15 x height
Divide both sides by 15:
Height = 165 / 15
Height = 11 inches.
Because you can't do it.
And I think your teacher means turn it into a improper fraction
Answer:
17 7/8
Step-by-step explanation:
8 1/8 = 65/8
9 3/4 = 39/4 = 78/8
8 1/8 + 9 3/4
= 65/8 + 78/8
= (65 + 78) / 8
= 143/8
= (17*8 + 7) / 8
= (17*8)/8 + 7/8
= 17 7/8