Please help (sorry abt the quality again)

Lines p and q intersect. find the value of b. show your work. cite any theorems you use.

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)