The answer is: x-y = 11 3x+10y = -6
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x = 4y 3x - 2y = 20 Substituting the value of x into the second equation, 3*(4y) - 2y = 20 ie 12y - 2y = 20 or 10y = 20 so that y = 2 Then x = 4y = 4*2 = 8. So (x , y) = (8 , 2)
y = 3x + 2 y-2 = 3x x = (y-2)/3 So the inverse is (x-2)/3
y = 3x - 2 3x = y + 2 x = y + 2 --------- 3
3x^2 - 27 = = 3(x^2 - 9) = 3(x^2 - 3^2) = 3(x - 3)(x + 3)
5=3x+2 3x+2-2=5-2 3x=3 ------ 3 x=1