Which of the following is not linear?

x=-4
y = // - 1
y= 2 x + 6
3x +2y = 8

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations. click to let others know, how is it

its d i know cause i've been googling it

answer; language that can promote racial stereotypes;