To use the substitution method we need to convert one equation in terms of a certain variable and substitute this equation to the other equation. For this case we are asked to substitute the first equation to x in the second equation. Therefore, the equation to substitute is:
<span>-x - 2y = -4
</span>x = 4 - 2y
Answer:
.2, .4, .44, .12, I'm too lazy to do the rest
Step-by-step explanation:
The answer is the first and second answers. This is because when you deal with ratios you can get an equal ratio by multiplying both sides of the ratio by the same number. In the first answer both side of the ratio were multiplied by 2. 4 x 2 = 8 and 1 x 2 = 2.
Option b: 7000
Explanation:
The function that Larissa earns on an investment is
![f(x)=7000(1+0.03)^{x}](https://tex.z-dn.net/?f=f%28x%29%3D7000%281%2B0.03%29%5E%7Bx%7D)
The amount of money originally invested by Larissa can be found using the compound interest formula,
![f(x)=p(1+r)^{x}](https://tex.z-dn.net/?f=f%28x%29%3Dp%281%2Br%29%5E%7Bx%7D)
where
P is the amount of money invested. (Principal)
r is the rate of interest which can be expressed as decimals.
x is the number of periods.
Hence, comparing
with the formula
, the principal amount can be determined.
Thus, the principal amount is 7000.