Answer:
The bookstore receive 9 boxes.
Step-by-step explanation:
The answer is (-4,-4) because y has to equal x, the first -4 is the x and the second one is the y
2×6 ones= 12 ones
2× 4 tens(40)=80(8 tens)
tens(10)+1 ten=20(2 tens)
2×3 hundreds(300)=600(6 hundreds)
X-9=8(2x+3)-18
x-9=16x+24-18
-9=15x+6
-15=15x
x=-1