Answer:
12x-3y
Step-by-step explanation:
10x3 + x + X
Group like terms
10x + x +X-3
Add similar elements: 10x + x + x = 12x
= 12x - 3y
X+y=7
X-y=3
_____
2x. =10
2x/2=10/2
X=5
In any inequality or equation, a number that does not change is called a constant.
The Formula:Number of stacks multiplied by number of pennies in each stack
So 50x10=500
and talking money wise he has 5 dollars
