It is k*3x where k is an integer such that 10/(3x) < k < y/(3x)
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10-y=2y+3 10-3=2y+y 7=3y 7/3=y
The answer is y+3-3=7+3 y=10.
-13
X - Y = 10 X + Y = 4 -------------------+ ( add them ) 2X = 14 X = 7 ----------find Y in one of the equations; top looks good 7 - Y = 10 - Y = 3 Y = - 3 ---------------check both equations for consistency 7 - (- 3) = 10 7 + 3 = 10 10 = 10 ------------checks in top 7 + (- 3) = 4 7 - 3 = 4 4 = 4 ------------checks and is consistent (7, - 3) ( the answer )
y = xz where x = 3, z = 10 y = 3 x 10 = 30