f(x) is a function of x. To find f(-2), plug in the value of x=-2.

The answer is -2.
The 25% discount would save the most money.
For example, say the employee has a purchase total of $12.00.
If a 10% discount was applied, the cost would be $10.80.
However, if a 25% discount was applied, the cost would be $9.00.
Using the linear combination method, we can add 3x+7y=31 and -3x-2y=-1 together, which makes 5y=30.
Just divide both sides by 5, and your answer will be y = 6.
To solve for x, just substitute 6 in y in either equation and solve for x:

In short, the correct answer is B. -3 2/3
500m/2min = 250m/1min= 250m/min.
Hope this helps!
-3 u +2 v
where
u=< -6,-2>
v=< -2, 3>
-3 u +2 v
-3 * <-6, -2> + 2*<-2, 3>
<-3 *-6 , -3 *-2> + < 2*-2 , 2*3>
<18, 6> + < -4, 6>
<18 + (-4) , 6 +6>
<18-4, 6+6>
<14,12>