Answer: 390
Step-by-step explanation: Well if its 30 miles per gallon and you have 13 gallons do 30*13 which is 390
If you expand -9(-2x-3) you get 18x+27 (a minus times a minus is a positive) so the answer is A.
Answer:
x = -5
y = -5
Step-by-step explanation:
If you multiply the top equation by negative 2, you can add it to the bottom equation and cancel out the x:
-2(-x + 5y = -20) --> 2x - 10y = 40
Add this to the bottom equation top to bottom:
2x - 10y = 40
-2x + 4y = -10
You get:
-6y = 30
Then solve for y:
y = -5
Plug this back in for either equation and solve for x:
-x + 5(-5) = -20
-x -25 = -20
-x = 5
x = -5
Your answers are:
x = -5
y = -5
Since x=7 we plug the number in for x and get 7-8
Answer= -1
