SOLUTION: How do I find the point of intersection of the pair of straight lines y=-8x-10 -y=9x+9 (x,y)= (?,?)

Algebra ->  Linear-equations -> SOLUTION: How do I find the point of intersection of the pair of straight lines y=-8x-10 -y=9x+9 (x,y)= (?,?)      Log On


   

Question 239152: How do I find the point of intersection of the pair of straight lines
y=-8x-10
-y=9x+9
(x,y)= (?,?)
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
y=-8x-10 (red line)
-y=9x+9
y=9x/-1+9/-1
y=-9x-9 (green line)
You can solve the 2 equations for x & y or you can graph them & calculate the intersection.
y=-8x-10
-y=9x+9 add
----------------------
0=x-1
x=1 ans.
y=-8*1-10
y=-8-10
y=-18
(x,y)= (1,-18)
+graph%28+300%2C+200%2C+-6%2C+5%2C+-25%2C+10%2C+-8x+-10%2C+-9x+-9%29+ (graph 300x200 pixels, x from -6 to 5, y from -25 to 10, of TWO functions -8x -10 and -9x -9).