Which statements are true about the ordered pair (-1,-4) and the system of equations?

x-y=3

7x-y=-3

Question 1 options:

When (-1,-4) is substituted into the first equation, the equation is false.

When (-1,-4) is substituted into the first equation, the equation is true.

When (-1,-4) is substituted into the second equation, the equation is false.

When (-1,-4) is substituted into the second equation, the equation is true.

The ordered pair (-1,-4) is a solution to the system of linear equations

The ordered pair (-1,-4) is not a solution to the system of linear equations.

Question

contestada

Respuesta :

kudzordzifrancis kudzordzifrancis · Answer 1 · 2019-12-14T05:14:30+01:00

Answer:

When (-1,-4) is substituted into the first equation, the equation is true.

When (-1,-4) is substituted into the second equation, the equation is true.

Step-by-step explanation:

The given system is

x-y=3

7x-y=-3

Make x the subject in the top equation to get:

x=y+3

Put x=y+3 in the bottom equation to get:

7(y+3)-y=-3

Expand

7y+21-y=-3

7y-y=-3-21

6y=-24

y=-4

Put y=-4 into x=y+3 to get

x=-4+3=-1

Hence the point (-1,-4) is a solution to both equation