X=25
4x-10=90
Add 10 to both sides
4x=100
Divide both sides by 4
I think this is the answer
A)Cathy had $6 at first
B)Selena has $24 at first
I think 63, but I'm not sure, how do I delete an answer-
Answer:
Pretty sure its B.
Step-by-step explanation:
Because in just learned it.
Remark
You are using the midpoint formula. Instead of finding the midpoint, you are looking for one of the points, so you have to rearrange the formula a little bit.
Givens
Midpoint (4,2)
One endpoint (6,1)
Object
Find the other endpoint.
Formula
m(x,y) = (x1 + x2)/2, (y1 + y2)/2)
Solution
Find the x value
4 = (6 + x2)/2 Multiply both sides by 2
4*2 = 6 + x2 Subtract 6 from both sides.
8 - 6 = x2
x2 = 2
Find the y value
2 = (1 + y2)/2 Multiply by 2
4 = 1 + y2 Subtract 1 from both sides.
4 - 1 = y2
y2 = 3
Conclusion
R(x,y) = (2,3)
