The equation −3x−9=−21 is solved as follows. Supply the correct numbers to complete the solution.(1 point) −3x−9=−21 −3x= Add 9 to both sides. x= Divide both sides by −3.
Fill in the box that says -3x = ? (Add 9 to both sides)
Fill in the box that says x = ? (Divide both sides by -3
-3x = -21 + 9 = -12
x = -12 / -3 = 4
-3x = -21 + 9
-3x = -12
x = (-12)/-3
x = 4
To solve the equation −3x−9=−21, we need to follow the steps provided.
Step 1: Start with the equation −3x−9=−21.
Step 2: Add 9 to both sides of the equation. This is done to isolate the term containing x on one side of the equation. Since −9 is being subtracted from −3x, adding 9 will cancel out the −9 on the left side.
So, −3x−9 + 9 = −21 + 9 becomes −3x = −12.
To fill in the box that says -3x = ? (Add 9 to both sides), we move the −9 from the left side to the right side of the equation by adding 9 to both sides. The result is -3x = -12.
Step 3: Divide both sides of the equation by −3. This is done to solve for x. Dividing both sides by -3 will cancel out the coefficient -3 on the left side.
So, (-3x) / -3 = (-12) / -3 becomes x = 4.
To fill in the box that says x = ? (Divide both sides by -3), we divide both sides of the equation -3x = -12 by -3. The result is x = 4.
Therefore, to complete the solution:
-3x = -12
x = 4