Answer:In the equation y = mx + b for a straight line, the number m is called the slope of the line. Let x = 0, then y = m • 0 + b, so y = b. The number b is the coordinate on the y-axis where the graph crosses the y-axi
2x - 3y = 7 and -3x + y = 7..multiply Equation 2 by THREE and add to Equation 1 -9x + 3y = 21...........................watch the y's disappear -7x........ = 28 x = -4 substitute -4 instead of x in either of the ORIGINAL equations
2x - 3y = 7 2(-4) - 3y = 7 -8 -3y = 7..........add 8 to both sides -3y = 15 y = -5
