Solving Using the Multiplication Property
To solve the equation , the variable is being divided by , so the Multiplication Property of Equality is used to undo that division.
Step 1 — Multiply both sides by the divisor: Multiply each side of the equation by :
Step 2 — Simplify: On the left side, , because multiplying by the same number that divides the variable cancels the division. On the right side, (two negative factors produce a positive product):
Step 3 — Check by substitution: Replace with in the original equation:
Because both sides are equal, is confirmed as the solution. This example illustrates how multiplying both sides by a negative number works the same way as multiplying by a positive number — the key is to multiply by whatever value the variable is being divided by, so that the division is reversed and the variable is isolated.
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