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Solve an equation using subtraction
EXAMPLE 1
Solve x + 7 = 4.
x + 7 = 4 Write original equation.
x + 7 – 7 = 4 – 7 Use subtraction property of equality: Subtract 7 from each side.
x = – 3 Simplify.
ANSWERThe solution is – 3.
Solve an equation using subtraction
EXAMPLE 1
CHECK Substitute – 3 for x in the original equation.
x + 7 = 4 Write original equation.
–3 + 7 = 4? Substitute –3 for x.
4 = 4 Simplify. Solution checks.
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