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CHAPTER3.2T
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à 3.2ïEquations and the multiplication property.
äïPlease solve the following equations using the
multiplication property.
â
êê1êè1êè ┌ 1ë┐è 1êê 3
2x = 3,ë ─ ∙ (2x) = ─ ∙ 3,ë │ ─ ∙ 2 │x = ─ ∙ 3,ë x = ─
êê2êè2êè └ 2ë┘è 2êê 2
éS
The multiplication property says that you may multiply both sides of an
existing equation by the same non zero number.ïThis can be helpful when
trying to solve for "x" in a linear equation.ïThe following equation is
multiplied by one third.
êèStep 1ê3x = 12
êêêï1ê 1
êèStep 2ê─ ∙ 3x = ─ ∙ 12èThe associative property of
êêêï3ê 3ê multiplication is used when
êêêêêë going from step 2 to step 3.
êêê ┌ 1ë┐è 12
êèStep 3ë │ ─ ∙ 3 │x = ──è The multiplicative inverse
êêê └ 3ë┘ë3è property is used going from
êêêêêë step 3 to step 4, and the
êèStep 4ë [1]x = 4êè multiplicative identity is used
êèStep 5êïx = 4êè from step 4 to step 5.
1
êêêêSolveï6x = 30
êïA)ï5ê B)ï6ê C)ï15êD)ïå of ç
üêêêè 6x = 30,
è 1êï1êë ┌ 1ë┐è 1êêë 1
è ─ ∙(6x) = ─ ∙ 30,ê│ ─ ∙ 6 │x = ─ ∙ 30,ê[1]x = ─ ∙ 30,
è 6êï6êë └ 6ë┘è 6êêë 6
êêêêëx = 5
Ç A
2
êêêê Solve 10y = -5
êêêê1
êïA)ï50êB)ï- ─ë C)ï-25ë D)ïå of ç
êêêê2
üêêêè10y = -5,
1êè 1êè ┌ï1è┐ë1êêè1êê1
── ∙(10y) = ── ∙(-5),è │ ──∙10│y = ──∙(-5),è[1]y = ──∙(-5),ïy = - ─
10êè10êè └ 10è┘è 10êêï10êê2
Ç B
3
êêêèSolveï3z + z + 4z = 32
êïA)ï12êB)ï16êC)ï4ê D)ïå of ç
üêë3z + z + 4z = 32,ê8z = 32
è 1êï1êë ┌ 1ë┐è 1êêë 1
è ─ ∙(8z) = ─ ∙ 32,ê│ ─ ∙ 8 │z = ─ ∙ 32,ê[1]z = ─ ∙ 32,
è 8êï8êë └ 8ë┘è 8êêë 8
êêêêëz = 4
Ç C
4
êêêèSolveï6r - 14r = -12
êêêë3
êïA)ï-6êB)ï─ê C)ï-12ë D)ïå of ç
êêêë6
ü
êêë 6r - 14r = -12,ë-8r = -12
è┌ï1ë ┐è ┌ï1 ┐êêï┌ï1 ┐êê12ê3
è│- ─ ∙(-8)│r = │- ─ │∙(-12),è1∙r = │- ─ │∙(-12),èr = ──,ïr = ─
è└ï8ë ┘è └ï8 ┘êêï└ï8 ┘êê 8ê2
Ç D
5
êêêïSolveï6y + 4y - 12y = -3
êë 3
êïA)ï─ê B)ï-6êC)ï8ê D)ïå of ç
êë 2
ü
êêë 6y + 4y - 12y = -3,ë-2y = -3
è ┌ï1ë ┐è ┌ï1 ┐êêè┌ï1 ┐êê 3
è │- ─ ∙(-2)│y = │- ─ │∙(-3),ë1∙y = │- ─ │∙(-3),ëy = ─
è └ï2ë ┘è └ï2 ┘êêè└ï2 ┘êê 2
Ç A
6êêêè 3
êêêè Solveè ─∙x = 6
êêêêë 4
êë 2
êïA)ï─ê B)ï4ê C)ï8ê D)ïå of ç
êë 3
ü
3êè┌ 4è3 ┐è ┌ 4 ┐êê4êë 24
─x = 6,è │ ─ ∙ ─ │x = │ ─ │∙6,ë1∙x = ─ ∙ 6,è x = ──,è x = 8
4êè└ 3è4 ┘è └ 3 ┘êê3êê3
Ç C
7êêêè 2ë4
êêêè Solveï- ─∙x = ─
êêêêë 3ë7
êêêë 6
êïA)ï42êB) - ─êC)ï-12ë D)ïå of ç
êêêë 7
ü
êë┌êë┐
ï2è 4è │┌ï3 ┐┌ï2 ┐│è ┌ï3 ┐è4êè ┌ï3 ┐è4êè6
- ─x = ─,è││- ─ ││- ─ ││x = │- ─ │ ∙ ─ ,è1∙x = │- ─ │ ∙ ─,èx = - ─
ï3è 7è │└ï2 ┘└ï3 ┘│è └ï2 ┘è7êè └ï2 ┘è7êè7
êë└êë┘
Ç B
8
êêêë Solve 4.2x = 8.4
êïA)ï2ê B)ï12.1ëC)ï.2êD)ïå of ç
üêêêï4.2x = 8.4
1êë1êë┌ï1ë┐ë1êêè 1
───∙(4.2x) = ───∙(8.4),è │ ───∙4.2│x = ───∙(8.4),è 1x = ───∙(8.4)
4.2êè4.2êè └ 4.2è ┘è 4.2êêï4.2
êêêêëx = 2
Ç A