Answer:
Fast train speed: 69 km/h
Slow train speed: 39 km/h
Step-by-step explanation:
Fast train:
-Time: 4.33
-Speed: x
-Distance: 4.33x
Slow train:
-Time: 7.66
-Speed: x - 30
-Distance: 7.66(x - 30)
7.66(x - 30) = 4.33x
7.66x - 229.8 = 4.33x
3.33x = 229.8
x = 69
Answer:
(12, -3)
Step-by-step explanation:
You can solve it algebraically or graphically. Graphically you find the intersection point. Algebraically with substitution/elimination.
Answer:
48
Step-by-step explanation:
Given,
x = - 1
y = 2
To find : The value of 3x - 4 ⋅ xy² ?
Substitute the given values of x and y in the expression 3x - 4 ⋅ xy².
3x - 4 ⋅ xy²
= 3 ( - 1 ) - 4 ⋅ ( - 1 ) ( 2 )²
= - 3 - 4 ⋅ - 1 ( 4 )
= - 12 ⋅ - 4
= 48
Note : -
When a negative number gets multiplied with a negative, the resulted number is a positive number.