4y - 5x = 9
x = 4y + 11
We can substitute this value of x in the first equation:
4y - 5(4y+11) = 9
4y - 20y - 55 = 9
16y = -64
y = -4
x = 4y + 11
x = -16 + 11
x = -5
Answer:
5+5 is 10 is simple question
The answer is 21 because I added 8 + 10+3=and I got 21
<em>Each side of the cube is 10 in long.</em>
- Step-by-step explanation:
<em>Hi there ! </em>
<em>volume cube formula</em>
<em>V = s³</em>
<em>1000in³ = s³</em>
<em>(10in)³ = s³</em>
<em>s = 10 in</em>
<em>Good luck !</em>
We can solve this problem using discriminant.
x^2-4x-12's discriminant is
(-4)^2-4*-12=16+48 which is clearly larger than 0
This means that it crosses over the axes 2 times.
In case you don't know what discriminant is, its in equation ax^2+bx+c
the discriminant is b^2-4ac.
If its positive it has 2 crosses with x axis, if negative then 0 crosses, if 0 then 1 cross.
Hope this helped at least a little bit :D