Answer:
A
Step-by-step explanation:
I hope this was helpful, if you want the work then let me know.
Answer:
x = -7
, y = -5
Step-by-step explanation:
Solve the following system:
{3 y - 3 x = 6 | (equation 1)
3 x + 5 y = -46 | (equation 2)
Add equation 1 to equation 2:
{-(3 x) + 3 y = 6 | (equation 1)
0 x+8 y = -40 | (equation 2)
Divide equation 1 by 3:
{-x + y = 2 | (equation 1)
0 x+8 y = -40 | (equation 2)
Divide equation 2 by 8:
{-x + y = 2 | (equation 1)
0 x+y = -5 | (equation 2)
Subtract equation 2 from equation 1:
{-x+0 y = 7 | (equation 1)
0 x+y = -5 | (equation 2)
Multiply equation 1 by -1:
{x+0 y = -7 | (equation 1)
0 x+y = -5 | (equation 2)
Collect results:
Answer: {x = -7
, y = -5
She earns $9/hour. If you add up 2.5 and 4.5, you would get 7. Now you just need to divide. 54/7=9.
Answer:
$16,800
Step-by-step explanation:
You would do 21,000×0.20, which equals 4,200.
Since 4,200 equals 20% of 21,000, then you would do 21,000-4,200 which equals 16,800. So the car is worth $16,800 dollars when she bought it.