Answer:
C
Step-by-step explanation:
Minus two equations , we got:
9x-9y= 132-(-12)
9x-9y=144
x-y=16
the solution of:
x²=20
√x² = √(2² × 5)
x=2√5
So the answer is
A. x= ±2√5
matters on amount of dog food bought
12 for 1 bag
19 for 2 bags
26 for 3 bags
33 for 4 bags
x=0
x+2=3x+2
Step 1: Subtract 3x from both sides.
x+2−3x=3x+2−3x
−2x+2=2
Step 2: Subtract 2 from both sides.
−2x+2−2=2−2
−2x=0
Step 3: Divide both sides by -2.
−2x
−2
=
0
