82 because it is the opposite of -(-82)
<span>A) 2x + 4y + z = 3
B) x − 2y − 3z = 4
C) x + y − z = −1
Multiplying B & C by -1
</span>
<span>B) -x + 2y + 3z = -4
C) -x - y + z = +1 Then adding to A
</span><span>A) 2x + 4y + z = 3
5y + 5z = 0
So basically z = -y
</span><span>A) 2x + 4y -y = 3
B) x − 2y + 3y = 4
C) x + y +y = −1
</span><span>
A) 2x + 3y = 3</span>
Multiplyig B by -2
B) -2x -2y= -8
<span>C) x + 2y = −1 Adding B&C
-x = -9
x = 9
</span>
A) 2*9 + 4y + z = 3
A) 4y + z = -15
B) 9 − 2y − 3z = 4
<span>B) − 2y − 3z = -5
</span>A) 4y + z = -15
B) − 2y − 3z = -5
Multiplying A by 3
A) 12y + 3z = -45
B) − 2y − 3z = -5 Then adding A & B
10y = -50
y = -5
C) x + y − z = −1
C) 9 -5 − z = −1
<span>C)5 =z
</span>So x = 9
y= -5
z = 5
Wow!!!!!!!!!!!!
You have to reduse it, so you take the top number and see how mant times it can go into the bottem number then divide the number it goes into both numbers
40cm/8min=5cm/min
or
8min/40cm=0.2min/cm