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l₁ is 5x+8y=-9, so y=-(5x+9)/8, and the gradient is -5/8. The gradient of l₂ is 8/5 so m=8/5.

It passes through (10,10) so y-10=(8/5)(x-10), y=8x/5-16+10, therefore y=8x/5-6 making b=-6.

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