Question

someone help me with my algebra homework please

Answer 1

Answer:

15

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. 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

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

Answer 2

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