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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square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743