Solve 2x+4 so that it has one solution

-2

Step-by-step explanation:

We can set it equal to zero

2x+4 = 0

2x =-4

x = -2

x = -2

Step-by-step explanation:

To solve for variables, we need the equation to be set equal to something. If no other number is given, assume zero.

2x + 4 = 0

Move 4 to the right by subtracting it from the left and right (since it is being added).

2x = -4

Next, isolate x by dividing both sides by 2 (since x is being multiplied by 2)

x = -2

We can check that this is correct by plugging in -2 for x and seeing if we get zero.

2(-2) + 4 = 0

-4 + 4 = 0

0 = 0

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: