4x+2x=84
3x+5y=126
5x+4y=?
--------------------
cerco la x nella prima equazione:
4x+2y=84
x=(84-2y)/4
x=(42-y)/2
-------------------------------------------------------------------------
cerco la y nella seconda equazione, sostituendo la x:
3x+5y=126
3[(42-y)/2]+5y=126
y= -18
------------------------------------------------------------------------
cerco la x della nella equazione, sostituendo la y:
4x+2y=84
4x+2(-18)=84
x=30
---------------------------------------------------------------------------------------------------
cerco i totale nella terza equazione, sostituendo i valori della x e della y:
5x+4y= ?
5*30 + 4*(-18)= 150-72 = 78
Answer:
GO STUDY!
Step-by-step explanation:
Good Luck!
Answer:
50 degrees.
Step-by-step explanation:
Angle FGE = 
because angles on a straight line add up to 180 degrees.
Angle EFG = 
(Angles in a triangle add up to 180)
Add 20 to both sides:
Subtract 6x from both sides:
Angle 
How dos3es it want it in decimsal form there are a couple ways in decimal form at list i was tought
Let the number of hours = X
Multiply the speed of each train by the number of hours (x) and add them together to equal the total miles:
75x + 95x = 238
Simplify:
170x = 238
Divide both sides by 170:
x = 238/170
x = 1.4 hours.
Check:
75 x 1.4 = 105 miles
95 x 1.4 = 133 miles
105 + 133 = 238 miles
It will take 1.4 hours ( 1 hour and 24 minutes).
