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Sagot :
Answer: (9,3)
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Explanation:
We can replace y in the first equation with -x+12 due to the second equation.
x+4y = 21
x+4( y ) = 21
x + 4(-x+12) = 21
x-4x+48 = 21
-3x = 21-48
-3x = -27
x = -27/(-3)
x = 9
which leads to,
y = -x+12
y = -9+12
y = 3
Therefore, the solution as an ordered pair is (x,y) = (9, 3)
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Check:
x+4y = 21
9+4(3) = 21
9+12 = 21
21 = 21 .... the first equation works
and,
y = -x+12
3 = -9+12
3 = 3 ... so does the second equation
Both equations are true for those x and y values. The answer is fully confirmed.
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