Answer:
1. x >= 5
2. x > -8
3. x < 4
4. x <= 8
Step-by-step explanation:
Using the magic of algebra!:
The time each train goes in 1 hour will be represented as a / b.
b is 30 more than a, so if we add 30 to a it should equal b.
a + 30 = b
In three hours, the trains are 330 miles apart.
Esentially, we're adding up the distance each train goes from the starting point to find the distance between them.
3b + 3a = 330
Now we have a system of equations to solve.
a + 30 = b
3b + 3a = 330
We want to get the variables on seperate sides of the equation for easy solving.
a + 30 = b
3b = 330 - 3a
Then get the value of the one variable the same so we can use the transitive property.
a + 30 = b
b = 110 - a
a + 30 = 110 - a
2a + 30 = 110
2a = 80
a = 40 mph
(And thus b = 70 mph)
Answer:
Someone forgot to write the full question.
Step-by-step explanation:
Answer:
400 Dollars
Step-by-step explanation:
It is 400 dollars since 5 yards and 4 yards which are the dimensions of this room is multiplied together, it is 20 and each square yard is 20 dollars which concludes you to multiply 20 by 20 and gives us the answer 400.
Answer:
y=2x-4
Step-by-step explanation:
find the gradient
m=y2-y1/x2-x1
m=2-0/3-2
m=2
then find the equation
y-y1=m(x-x1)
y-0=2(x-2)
y-0=2x-4
y=2x-4
