Answer:
3x−4y=9 −3x+2y=9
Add these equations to eliminate x: −2y=18
Then solve−2y=18
for y: −2y=18 −2y −2 = 18 −2 (Divide both sides by -2)
y=−9
Now that we've found y let's plug it back in to solve for x.
Write down an original equation: 3x−4y=9
Substitute−9for y in 3x−4y=9: 3x−(4)(−9)=9
3x+36=9(Simplify both sides of the equation)
3x+36+−36=9+−36(Add -36 to both sides)
3x=−27 3x 3 = −27 3 (Divide both sides by 3) x=−9
Answer: x=−9 and y=−9
Hope This Helps!!!
Answer:
If 2 mph) 5 hours
If 2.5 mph) 4 hours
If m mph) 10/m hours
If m+2 mph) 10/(m+2) hours
If m/3 mph) 30/m hours
Step-by-step explanation:
To find the time divide the distance (10) by the speed.
10/2=5
10/2.5=4
10/m
10/(m+2)
10/(m/3)=10(3/m)=30/m
Answer:
- a. More than 20
- b. Less than 10
- b. Less than 0.2
Step-by-step explanation:
- 212.5
- 9.7
- 0.1608
Hope it helped you
To calculate the rate of change, one must divide the total change by the amount of time that it took, in this case years. One can find the total change by subtracting the two quantities, $15,200 and $8,000. This gives a rate of change of $7,200 per four years. To find the change per year, one must do what I said in the first sentence, divide the total change by the amount of time. Doing this, one gets $1,800 changed per year, assuming there was a constant rate of change.
