mathman783
31.03.2021 •
Mathematics
Equivalent expressions are
A. equal for all values of the variable
B. equal for some values of the variable
witch one
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Ответ:
first car is x
second car is y
25x+30y=1550
x+y=55
Multiply the second equation by -25 for elimination method to cancel out x
-25x-25y=-1375
Add the two equations
5y=175
y=35
Plug this value into the second equation
x+35=55
x=20
Final answers:
First car=20 gallons
Second car=35 gallons