itsyagirlgona21
04.08.2019 •
Mathematics
If 3m equals 129, then what is m? 3m=129 m?
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Ответ:
x=2 and y=-2
Step-by-step explanation:
y+3x= 4(1)
y-4x= -10(2)
Subtract equation 2 from 1
y+3x= 4
-y-4x= -10
0+7x = 14
7x = 14
divide both sides by 7
7x = 14
7 7
x = 2
Substitute x=2 into equation 1
y = -3x + 4
y = -3(2) + 4
y = -6 + 4
y = -2
x = 2 and y = -2