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Put the steps in order that are used to solve the following systems of equations by substitution.

-7х - 2y =
—13
x - 2y = 11
(10 points)
=
x - 2y = 11 →> x = 2y +11

= 7(2y + 11) - 2y=-13

=-16y-77=-13

=x- 2(-4) = 11

=y=-4

= - 16y = 64

= x+8=11

= x =3

=-14y-77-2y=-13

= (3, -4)

1 answer

To solve the given system of equations using the substitution method, we can arrange the steps in the correct order:

  1. \( x - 2y = 11 \) → \( x = 2y + 11 \) (Isolate x)

  2. Substitute \( x \) in the first equation: \(-7(2y + 11) - 2y = -13\)

  3. Distribute -7: \(-14y - 77 - 2y = -13\)

  4. Combine like terms: \(-16y - 77 = -13\)

  5. Add 77 to both sides: \(-16y = 64\)

  6. Divide by -16: \(y = -4\)

  7. Substitute \( y \) back into the equation for \( x \): \( x - 2(-4) = 11\)

  8. Simplify: \( x + 8 = 11\)

  9. Solve for \( x \): \( x = 3\)

  10. Write the solution as an ordered pair: \( (3, -4) \)

So the ordered sequence is: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 → 10.