Line m has the equation y = 3x + 5. Line n has the equation y = kx - 7. Lines m and n intersect at the point (-4, -7). What is the value of k?
If y=3x+5 intersects y=kx-7, then -4 and -7 must satisfy both equations. For y=kx-7:
y=kx-7
-7=k(-4)-7
-7=-4k-7
-4k=0
k=0