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Naddik [55]
3 years ago
11

Can anyone help me with this problem ots substitution in math

Mathematics
1 answer:
andrew11 [14]3 years ago
3 0
X - 3y = 12.....x = 3y + 12
so sub in 3y + 12 in for x in the other equation

2x + 5y = -20
2(3y + 12) + 5y = -20
6y + 24 + 5y = -20
6y + 5y = -20 - 24
11y = - 44
y = -44/11
y = -4

x - 3y = 12
x - 3(-4) = 12
x + 12 = 12
x = 12 - 12
x = 0

solution is (0,-4)
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