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Sagot :
{y=-7
{4x+y=9 Substitute y.
4x+(-7)=9
4x-7=9 /+7
4x=16 /:4
x=4
Solution; (4; -7)
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)
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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