Solve the systems of equations 2y+7x=-5, 5y-7x=12

We can solve this by substitution.

Look at the second equation. If we rearrange to find 7x, we can substitute in the value into the first equation.

Therefore

Now let's replace the 7x in the first equation with 5y - 12:

     (substitute in 7x = 5y - 12)

Now that we know y, we can find x by substituting in y = 1 into any equation we want. I will use the equation: 7x = 5y - 12

  (Substitute in y = 1)

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"a" determine whether sage found the correct quotient. show your work

step-by-step explanation: