Question 965172
give the slope and y-intercept for each equation and then the number of solutions for the system:
x + 200y = -30
200y=-x-30
y=-x/200-30/200
slope=-1/200; y-intercept=-30/200
..
10x - 70y = 100
70y=10x-100
y=10x/70-100/70
slope=1/7; y-intercept=-100/70
..
-x/200-30/200=10x/70-100/70
-x/200-3/20=x/7-10/7
lcd:7*200
-7x-210=200x-2000
207x=1790
x=1790/207≈8.6473
y=-(x+30)/200≈-0.1932
point of intersection: (8.6473,-0.1932)