If x + 1 = y - 8 and x = 2y, then find x + y.
hey guest!
so we can express x as 2y. so the first equation becomes 2y+1=y-8.
2y+1=y-8
2y+9=y
y+9=0
y=-9
we simplify by subtracting 1 from both sides to get x=y-9 so we get that y is 9 more than x and also is 2 times x so y=-9 and x=-18
+738 
