5(n-4)=(4n-12)
First: Distribute 5 into n and -4.
5(n-4)=(5n)+(5*-4)= 5n-20.
Second: Subtract 4n from both sides to eliminate the variable from the right side of the equation.
(5n-20)=(4n-12)
n-20=-12
Next: Add 20 to both sides to eliminate the constant from the left side of the equation.
n-20=-12
n=8
The unknown number is 8.
I would but I’m like really bad at math so
Volume = base x width x height
Bill's Box is 8x20x6=960 cm^3
Martin's Box is 4x15x16=960 cm^3
Bill is right. The boxes have the same volume.
{ y=2x+2
{ y=4x-2
2x+2=4x-2
x=2
y=2 ⋅ 2+2
y=6
(x,y)=(2,6)
——
Check solution:
{ 6=2 ⋅ 2+2
{ 6=4 ⋅ 2-2
{6=6
{6=6
