Find the condition for the two lines to be coplanar. a1 + bjx + C7x + d, =0 = az + b2x + C2x + d2 az + b3x + C3x + d3 =0 = a4 + bạx + C4X + d4 I know that the general line passing through the first lines can be represented as a, + b;x + C,x + d, +k(a2 + b2x + C2x + d2), for real number k Also, the general line passing through the second lines can be represented as az + b3x + C3x + dz +d(a4 + bạx + C4x + d4), for real number r How do we then, prove the required result? Thank you!

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