Question

Which system of equations does not have a real solution?

Answer 1

Answer:

It's A.

Step-by-step explanation:

Let's look at option A:

From the second equation y =  -10 - x. Substituting in the first equation:

-10 - x = x^2 + 3x - 5

x^2 + 4x + 5 = 0

Checking the discriminant b^2 - 4ac we get 16 - 4*1*5 = -4 so there are no real roots. (A negative discriminant means no real roots).

So A has no real solution.

B.

x^2 + 3x - 5 =  (20 - 4x)/5 = 4 - 0.8x

x^2 +3.8x - 9 = 0

b^2 - 4ac = (3.8)^2 - 4*1*-9 = 50.44 (positive) so there are real roots.

C.

x^2 + 3x - 5 =  -9 - x

x^2 + 4x + 4 = 0

b^2 - 4ac =  4^2 - 4*1*4 = 0  so there are real roots.

Answer 2

Answer:

Correct answer is A!

Step-by-step explanation: