You never square a whole equation. That's just silly.
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-8 + 10x = 18 10x = 18+8 10x = 26 x = 26/10 x = 2.6
First collect like terms in the second equation: 5x - 18 = 4y - 3y ie y = 5x - 18 Substitute this for the term in y in the first equation, getting 3x + 2(5x - 18) = 16 ie 3x + 10x - 36 = 16 ie 13x = 16 + 36 so x = 4 and y = 5 x 4 - 18 ie 2.
y= -25
16
There is no such thing as what times what equals 18.There is only 1,2,9,16,25,36,49,64,81,100,121,144 as square numbers.