Answer:
Step-by-step explanation:
If 
are coordinates of a triangle then area of a triangle is equal to 
Let point P be 
Put 
Area of a triangle = 
Also,
Area of a triangle = 9 square units
±18 = -19 + 5x - 2y
The slope is 7/4 and the intercept is -10
Answer:
$5
Step-by-step explanation:
32-27 = 5
because he was earning 27 per skate board, that function shows him earning 32 per skate board which is an increase of $5.
<span>1)
11x+5y=20
2x+5y=-25
multiply the second equation by - 1 and add the result with the first equation:
11x + 5y = 20
- 2x - 5y = 25
-------------------
9x = 45
=> x = 45 / 9
=> x = 5
Replace in </span><span>2x+5y=-25
=> 2(5) + 5y = - 25
5y = - 25 - 10
5y = - 35
y = - 35 / 5
y = - 7
2)
3x+7y=-21
3x-7y=63</span>
Add the two equations:
3x + 3x + 0 = - 21 + 63
6x = 42
=> x = 42 / 6
=> x = 7
Replace in <span>3x-7y=63
3(7) - 7y = 63
=> 7y = 21 - 63
=-> 7y = - 42
=> y = - 42 / 6
=> y = - 7</span>
