8x-10y=-23
9x+10y=-16
(8x+9x)+(10y-10y)=(-23+(-16))
17x+0y=-39
x=-39/17
8(-39/17)-10y=-23
-312/17-10y=-23
-10y=-23+312/17
-10y=-79/17
y=79/170
The answer is 4a - 12 so b.
Answer:

Step-by-step explanation:
9.5 in value of adult tickets. 6.5 is value of children's tickets. combined selling of all of them should be greater than or equal to 800 ("atleast" in the question shows it can be more but cannot be less)
60x20=1200
1200/300=4
4x1/2=4/2=2 pounds of grass seed
A= π r^2, and we don't know r, so we'll have to use r = √C/π.
√C is and infinite number, and the square root of
π is an infinite number, so this problem is impossible.