Question 99877
Y=3*-5
Y=-15 ANSWER. (red line)
Y=-7X+4 SUBSTITUTE -15 FOR Y IN THIS EQUATION & SOLVE FOR X
-15=-7X+4
7X=4+15
7X=19
X=19/7
X=2.714 ANSWER. (green line)

{{{ graph( 300, 200, -6, 5, -18, 10, y = -15, y = -7x +4) }}} (graph 300x200 pixels, x from -6 to 5, y from -18 to 10, of TWO functions y = -15 and y = -7x +4).