Question

What is the value of the system determinant for the following system of equations?

6x + y = 4
5x + y - 7 = 0

-1
1
31

Answer 1

@TrojanPoem

Answer 2

Step: Solve6x+y=4for y:
6x+y+−6x=4+−6x(Add -6x to both sides)
y=−6x+4
Step: Substitute−6x+4foryin5x+y−7=0:
5x+y−7=0
5x+−6x+4−7=0
−x−3=0(Simplify both sides of the equation)
−x−3+3=0+3(Add 3 to both sides)
−x=3
−x
−1
=
3
−1
(Divide both sides by -1)
x=−3
Step: Substitute−3forxiny=−6x+4:
y=−6x+4
y=(−6)(−3)+4
y=22(Simplify both sides of the equation)
Answer:
y=22 and x=−3

Answer 3

so -1?

Answer 4

Is this cremer's rule ?

Answer 5

its solving linear systems algebraically

Answer 6

thats all i know...