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4y-16x-2=04y=16x+2y=4x+0.5L1: y=4x+5 L2: y=4x+0.5Both lines have the same gradient and are therefore parallel to each other

1.) y²/x2.) x²+2y3.) xy4.) y²-2x²

Let the cost of a pen = xLet the cost of a ruler = x+8Thus, (x*33) + ((x+8)*21) = £6 = 600 penceHence, 33x + 21x + 168 = 600 54x = 432 x = 8Therefore one pen costs 8 pence.

3 x ((2x + 5) /3) = 11 x 32x + 5 = 33(2x + 5) - 5 = 33 - 52x = 28 (2x) /2 = 28 / 2x = 14

(x+14)(x+2)=0
x=-14, x=-2