andy6128
24.06.2019 •
Mathematics
Idon’t understand how to do this at !
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Ответ:
x=3 y=1
Step-by-step explanation:
4x+3y =15
2x-5y=1
Multiply the second equation by -2
-2(2x-5y =1)
-4x +10y = -2
Add this to the first equation
4x+3y =15
-4x +10y = -2
13y = 13
Divide by 13
13y/13 =13/13
y =1
Now we need to find x
2x-5y =1
2x -5(1) =1
2x-5=1
Add 5 to each side
2x-5+5 =1+5
2x= 6
Divide by 2
2x/2 =6/2
x = 3
Ответ:
360=190+5x
170=5x
x=34