Solve a system of linear equations using substitution

What is the first step in solving a system of equations using substitution?

• Add the equations together

• Multiply both equations by the same number

• Graph the equations

• Isolate a variable with a coefficient of 1 or -1

Why is it beneficial to isolate a variable with a coefficient of 1 or -1?

• It makes the equation more complex

• It simplifies the substitution process

• It eliminates the need for substitution

• It allows for easier graphing

In the given system, which variable is isolated first?

• Y in the second equation

• X in the first equation

• X in the second equation

• Y in the first equation

What does the equation 15 = 15 indicate about the system of equations?

• There is no solution

• There is exactly one solution

• There are infinitely many solutions

• The equations are inconsistent

What does it mean graphically when a system of equations has infinitely many solutions?

• The lines are the same

• The lines are parallel

• The lines never intersect

• The lines intersect at one point