What is a possible first step in solving the equation? -4k + 9 = -k - 3

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

Why is x= 4 a solution to the proportion 14/x 56/1 6