Determine the missing number 420 + = 670 basically 420 + what = 670 so what equals 670 but has to include 420 P. S please note this is 5th grade please don't put all of this x=y i just need a 5th grade explanation

The answer is 250.

Step-by-step explanation:

Hello! This is a simple subtraction matter. All order-of-operations are opposites (multiplication and division, and addition and subtraction.) This means that since we're presented with a case where 420 + something = 670, the opposite is 670 - 420 = something.

If we compute some simple calculations, 670 - 420 = 250.

There's your answer :)

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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step-by-step explanation: