The one which has the greatest initial DOWNWARD velocity which is ball 4
So the two equations should be set up equal to each other.
1x + 8 = 2x - 4
now subtract 1x to 2x
8 = x - 4
now add 4 to 8
12 = x
to check you can plug it into x and see if they are both equal
The answer ex + 2<span> - 1</span>
The slopes must be paralell
y=mx+b
m=slope
y=(a+1)x+3 and
y=-3x+2
a+1=-3
a=-4
You're missing some operators there between the variable and the number which will change it drastically. I'll give you all the options.
3q+5=-2q+20
5q = 15
q=3
3q-5=-2q-20
5q = -15
q = -3
3q+5=-2q-20
5q = -25
q = -5
3q-5=-2q+20
5q = 25
q = 5