<span>As of January 8, 2015, the U.S. is $18.1 trillion in debt. (Source: National Priorities Project)
1 Trillion
= 1 Thousand Billion
= 1,000,000,000,000
= 10</span>¹²
<span>
---------------------------
U.S National debt currently stands at:
$ 18.1 x 10</span><span>¹²
</span><span>
*What information would be lost? Well firstly the 0's. The 0's put the size of the number into perspective. The word "trillion" would also be taken out of the picture, once again altering the perspective of the number.
Personally I'd prefer to hear "18.1 Trillion Dollars". Sounds more interesting.
</span>
Answer:
Step 1: Multiply the entire first equation by 2.
Step 2: Rewrite the system of equations, replacing the first equation with the new equation.
Step 3: Add the equations.
Step 4: Solve for x.
Step 5: Find the y-value by substituting in 3 for x in either equation.
Step 6: Identify the solution as an ordered pair.
3-7, 4-8, 2-6, and 1-5 are all corresponding.
81=16x²+24x+9
72=8(2x²+3x)
9=2x²+3x
0=2x²+3x-9
0=(2x-3)(x+3)
X=3/2 or -3
18=36x²+12x+1
0=36x²+12x-17
x=(-12±√(144-4(36)(-17))/2(36)
X=0.54 or 0.874
28=25x²+40x+16
0=25x²+40x-12
X=(-40±√(40²-4(25)(-12))/2(25)
X=-1.858 or 0.258
