I’m sure there’s more context that’s needed to be shown to me lmk
The Nearest rounded Hundred for 403.12 is 400.
Hope this Helped :)
Get x on one side then you can use substitution
So, change x+3y=3 to x= -3y+3
Then plug in x to other equation to find y
2(-3y +3)-3y=-12
-6y + 6 -3y = -12
-9y = -18
Divide both sides by negative nine to find y
y = 2
Then plug in to original equation to find x
x + 3(2) = 3
x + 6 = 3
x = -3
So, y = 2 and x = -3
Children=4
Notebooks=60
It said mama's got an amount of books, so you can transform this into a equation
X=children
Notebooks= 13x +8
Notebooks= 15x
Now you just establish a system of equations, thus notebooks=notebooks
13x + 8= 15x
2x=8
X= 4
23/103 = 0.22
0.22*100 = 22%
The percentage increase is 22%
Hope that helps!