Find the number of solutions to the system of equations y = -x ^ 3 y = -5x.
August 2, 2021 | education
| In order to determine the number of solutions to the system of equations:
y = -x ^ 3;
y = -5x,
let’s solve a system of these equations. And for the solution, we will use the substitution method. Let’s substitute the expression from the second into the first equation instead of the variable y and get:
System of equations:
-5x = -x ^ 3;
y = -5x.
We solve the first equation of the system:
x ^ 3 – 5x = 0;
x (x ^ 2 – 5) = 0;
1) x = 0;
2) x ^ 2 – 5 = 0;
x ^ 2 = 5;
x = √5;
x = -√5.
A set of systems:
System 1:
x = 0;
y = 0;
System 2:
x = √5;
y = -5√5;
System 3:
x = -√5;
y = 5√5.
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