Multiply 1st equation by 5
-5x + 10y = -20
now you have
-5x + 10y = -20
5x - 10y = 20
---------------------add
0 + 0 = 0
0 = 0
answer
C. the system has infinitely many solutions
An arrow to the left and a closed circle on -4 is:
x≤-4 or if you prefer:
x=(-oo,-4]
Answer:
y ≤
Step-by-step explanation:
We are to put the linear inequality;
7x - 4y ≥ 20
in slope intercept form.
We can rearrange the inequality as;
-4y ≥ - 7x + 20
Dividing throughout by -4 we get;
y ≤ - 5
Note that the inequality sign '≥' changes to '≤' since we divided all through with a negative number.
The introduction of imaginary numbers similar to the introduction of negative numbers through the determination of square root of a negative number.
<h3>Imaginary numbers </h3>
Complex numbers are square root of a negative number. Since a square root of a negative number cannot be determined, it is always represented with "i"
Given the rational number √-4 for instance, this will result in complex number or imaginary number since it is a negative number.
Learn more on imaginary number here: brainly.com/question/10662770