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3 years ago

Someone help me with my algebra homework please

Mathematics

2 answers:

Alla [95]3 years ago

7 0

Answer:

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Step-by-step explanation:

Step 1: Define

Identify

5a - 10b = 45

b = 3

Step 2: Solve for a

Substitute in b [Equation]: 5a - 10(3) = 45
Multiply: 5a - 30 = 45
[Addition Property of Equality] Add 30 on both sides: 5a = 75
[Division Property of Equality] Divide 5 on both sides: a = 15

EastWind [94]3 years ago

6 0

Answer:

a=3

Step-by-step explanation:

5a-10b=45

when b=3

5a-10×3=45

5a-30=45

collect like terms

5a=45-30

5a=15

a=3

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