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Karter Webb
Mathematics
17 December, 11:49
Substitution for 4x+y=9 and y=-7
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Atticus Herring
17 December, 12:14
0
4x + y = 9
y = - 7
Plug it in:
4x - 7 = 9
Add 7 to both sides:
4x = 16
Divide 4 to both sides:
x = 4
Plug this back into the equation:
4x + y = 9
4 (4) + y = 9
16 + y = 9
Subtract 16 to both sides:
y = - 7
So our solution is (4, - 7)
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Scarlett Huff
17 December, 12:19
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{y=-7
{4x+y=9 Substitute y.
4x + (-7) = 9
4x-7=9 / + 7
4x=16 / : 4
x=4
Solution; (4; - 7)
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