5y + 3 = 6y + 8
Subtract 5y from both sides: 3 = y + 8
Subtract 8 from both sides: -5 = y
So y = -5
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6y + (2-2)y = 6y 6(5) + (2-2)5 = 6(5) 30 + 0 = 30
It does nothing! 4x + 6y = 24 7x + 6y = 9 Subtracting the first equation from the second gives: 3x = - 15 so that x = -5 Substituting the value of x in the first equation gives -20 + 6y = 24 so that 6y = 44 and so y = 22/3 or 71/3
Subtracting gives: 10x = 80 so x = 8 and y = 5
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6y-5=8+10y 6y-10y=8+5 -4y=13 y=-3.,25 because: 6*3.25-5=-24,5 and 8+10*3.25=-24,5 true