Answer:
22
Step-by-step explanation:
since a negative times a negative equals a postive the equation becomes 15+7 which is 22
Is there supposed to be parentheses?
I think the 3rd one
Hope its right
I would say 3. 21/7=3. 3 boxes. 7 hard in each.
A) -4x + 9y = 9
B) x -3y = -6
We multiply B) by 3
B) 3x -9y = -18 Then add it to A)
-x = -9
x = 9
9 -3y = -6
3y = 15
y = 5
