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1. Assume that the line (1 passes through point A(1, 1, 2) and is parallel to both planes P1:x+2y2z7=0andPg:m2yz+4=0. Find (a) a vector with magnitude 3 that is parallel to the line [1; (b) the parametric equation of ll. 2. Assume that the plane P3 is perpendicular to the yzplane, and the line l2 : :r 2 215,3; = t, z = 1 2t lies on P3. Find the equation of P3. You must Show all steps to get the full credits