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(1) x is less than 4 Solution domain of y is found by plugging 4 for x, which leads to y=7
now, if x is less than 4 then try x = 3 which gives y = 7
but if x is - 10, then y = 21
So, statement 1 is insufficient
(2) x is greater than -3 try x = -3 .. gives y = 7
try x = -2 .. gives y = 7
but if x = 10 .. then y = 19
statement 2 is insufficient
(1) and (2) together I hope by now you see the pattern and how these two statement build a solution domain for values of x that result in y = 7
As long as x is less than 4 and larger than -3, the value of y will always be 7, of course given that x and y are integers.
So, statements 1 and 2 together are sufficient to answer the question