3x - 4 = 8
3x = 8+4
3x = 12
x = 12/3 = 4
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When x equals 8, the value of 5x would be 5 times 8, which is 40.
8x8 = 64 so it is 64 (the y) 3x4 = 12 so it is 12 (the x) 64+12 is 76.
Because 3 x 4 = 12
64
If x = 8 then x2 = 82 = 8 x 8 = 64