X-5y= -40
18x - 5y = 45
What is the answer to this

(5, 9)

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 Subtract Property of Equality

Algebra I

Solving systems of equations using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

x - 5y = -40

18x - 5y = 45

Step 2: Rewrite Systems

18x - 5y = 45

Multiply both sides by -1:                     -18x + 5y = -45

Step 3: Redefine Systems

x - 5y = -40

-18x + 5y = -45

Step 4: Solve for x

Elimination

Combine equations:                    -17x = -85Divide -17 on both sides:             x = 5

Step 5: Solve for y

Define equation:                    x - 5y = -40Substitute in x:                       5 - 5y = -40Isolate y term:                        -5y = -45Isolate y:                                 y = 9

12.5

Step-by-step explanation: