Or

What’s the value of x in the solution to this system of equitations: 3x + 4y =-3 x= -2y- 1

Viewed 575085 times
1
What’s the value of x in the solution to this system of equitations:
3x + 4y =-3
x= -2y- 1

2

x = -1

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
7. Subtraction
• Left to Right

Equality Properties

Algebra I

• Solving systems of equations using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

3x + 4y = -3

x = -2y - 1

Step 2: Solve for y

Substitution

1. Substitute in x:                    3(-2y - 1) + 4y = -3
2. Distribute 3:                         -6y - 3 + 4y = -3
3. Combine like terms:           -2y - 3 = -3
4. Isolate y term:                     -2y = 0
5. Isolate y:                              y = 0

Step 3: Solve for x

1. Define equation:                   x = -2y - 1
2. Substitute in y:                      x = -2(0) - 1
3. Multiply:                                 x = 0 - 1
4. Subtract:                                x = -1
15.5k 3 10 26