I think it has something to do with B
D. y = 1/5x - 1
Plug in 5 for x and 0 for y, and solve for b in the equation y=mx+b
The next step is most likely to add 3 to both sides, so that 3 cancels out, and 15 turns into 18.
The answer is: Step 4: 3x = 18
(I don't know if you want me to continue or not, but I will) ;)
Then divide by 3 on both sides so that 3 cancels out and 18 turns into 6, and you have the value of x.
Step 5: x = 6
You can check your answer by replacing x with 6.
5 · 6 - 2 · 6 - 3 = -2 + 17
15 = 15
Hope this helped! If you have anymore questions or don't understand, please comment or DM me. :)
Let the middle child be x
youngest child = x - 1
Oldest child = x + 1
(x - 1)^2 = 8(x + 1) + 4
x^2 - 2x + 1 = 8x + 8 + 4
x^2 - 10x - 11 = 0
(x - 11) * (x + 1) = 0
X = - 1 makes no sense. How can a middle child be - 1 years old?
x = 11
The youngest child is 10
The middle child is 11
The oldest child is 12
Check
=====
10^2 = 100
(8*12) + 4
96 + 4 = 100 So the results have been checked.
