The first relation gives two y-values for any given x-value (except x=6).
y² +x = 6 . . . . . is not a function
y² +x = 6 . . . . . is not a function
3x2 + 7x+3 5x2 + 12x
2 answers:
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y = 4
first note that the right side simplifies to 12, equation can be written
= 12 ( multiply both sides by 0.8 )
2y + 1.6 = 9.6 ( subtract 1.6 from both sides )
2y = 8 ( divide both sides by 2 )
y = 4