Answer:
if x is the number of miles driven, the equation is 2.25x + 12=30. solved: x = 8 miles
Step-by-step explanation:
First, you make the equation. If x is the number of miles, the price per mile would be 2.25 times x or 2.25x. You also have to add the one time fee of $12, so you have 2.25x + 12. Next, you're trying to find x if it costs $30 total so you would have 2.25x + 12 = 30.
Solving,
2.25x + 12 = 30
subtract 12 from both sides
2.25x = 18
divide both sides by 2.25
x = 8 miles
Answer:
it is (8;1)
Step-by-step explanation:
First:
2x + 2z = 4
2(x+z)=4
x+z=4/2
x=2-z
-x - y - z= -8
-(2-z)-y-z= -8 replace x
-2+z-y-z= -8 (cancel z)
-2-y= -8
6 = y
Then:
-4x + 4y + 5z = 7 replace x and y
-4(2-z)+4*6 + 5z = 7
-8 + 4z + 24 + 5z = 7
16 + 9z = 7
9z = 7 - 16
9z = -9
z = -9/9
z= -1
Finally
x= 2-z replace z
x = 2- (-1)
x = 3
The answer is 5 because it is consecutive 3 times and it is an odd number