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Mathematics
Maren Ingram
5 December, 05:06
Substitution for 4x+y=9 and y=-7
+4
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Zaniyah Roberts
5 December, 05:12
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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Kyle Calhoun
5 December, 05:40
0
{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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