18 ,2x18=36 hope i helped
Well,
If the slope of the lines are the same, then the lines are parralel.
We need to manipulate 2y - 10x = 4 into y = mx + b form.
Add 10x to both sides
2y = 10x + 4
Divide both sides by 2
y = 5x + 2
Do the same thing with the other equation.
Add 2 to both sides
y = 5x + 2
y = 5x + 2
It appears that, not only are they parallel, but they lie on exactly the same line! If this was a System of Simultaneous Linear Equations, then there would be an infinite number of solutions!<span />
Let x= number of 3 cent stamps
let y=number of 5 cent stamps
x+y=8
3x+5y=36
3x+5y=36 3x-5y=36
-3(x+y=8) . -3y-3y=-24
2y=12
y=6
x+6=8
-6 . -6
x=2
There will be 2 3 cent stamps and 6 5 cent stamps
83 divided by 7 (pounds in each box)
Gives you about 11.85 which you would round to 12, so Lily would need 12 boxes.
Are you just adding the first two numbers and multiplying by 2, then doing the second parenthesis? If so, the answer is 87
