Answer:
4(x-5)=4x-20
4x-20=4x-20
+<u>20 +20</u>
4x=4x
<u>-4x </u>-4x therefore there's infinite solutions
0=0
Write them as system of equations:
x=length, y=width
2x+2y=86
4x+2y+22=166
when you solve, then x=length=7, y=width=36
You just substitute the value of x in the given equation:
f(x) = 2x^2 - 5
f(-4) = 2 (-4)^2 -5 = 27
f(x) : a name given to the equation
f(-4): refer to the equation when the value of the independent variable x has the value between the brackets.