The value of x + y is indeterminate. You need the values of both x and y to determine x + y.
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2x+y = 10 x +y = 4 Subtract bottom equation from top equation: x = 6 Substitute the value of x into the equations to find the value of y: x = 6 and y = -2
Two solutions:x = 5 and y = 6, orx = 6 and y = 5.
2x + y = 25 x + y = 14 Subtract second equation from the first: x = 11 Substitute this value of x in the second equation: 11 + y = 14 ie y = 3
x + y + z = 0 x = a - b, y = b - c, z = c - a, therefore a - b + b - c + c - a = ? a - a + b - b + c - c = 0
If x = 4 and y = 2 then 4(5+2) = 28