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Lesson 2-5 Solving Equations by Adding or Subtracting • Solving an equation is like keeping a barbell balanced. • If you add weight to or subtract weight from one side of the bar, you must do the same on the other side • When you solve an equation the goal is to get the variable alone on one side of the equation • The value on the other side tells you the solution to the original equation. • You use inverse operations, which undo each other, to get the variable alone • The inverse of addition is • The inverse of subtraction is • The inverse of multiplication is • The inverse of division is • Subtraction Property of Equality – You can subtract the same number from each side of an equation 10 = 2(5) • Solve x+6=4 Always check your answer by putting it into the original equation • x+8=3 • 5=d+1 • c + (-4) = -5 • Addition Property – You can add the same number to each side of an equation 8 = 2(4) • Solve b – 12 = – 49 25 = p – 14