Math Problem Statement

Use substitution to solve the system: -2x + y = -3 and 5x - 3y = 5.

Solution

Let's solve the given system of equations using substitution. The system is:

-2x + y = -3 \tag{1} 5x - 3y = 5 \tag{2}

Step 1: Solve one equation for one variable

From equation (1), we can solve for yy in terms of xx:

y = 2x - 3 \tag{3}

Step 2: Substitute yy into the second equation

Now, substitute equation (3) into equation (2):

5x3(2x3)=55x - 3(2x - 3) = 5

Step 3: Simplify and solve for xx

Expand the equation:

5x6x+9=55x - 6x + 9 = 5

Combine like terms:

x+9=5-x + 9 = 5

Subtract 9 from both sides:

x=4-x = -4

Solve for xx:

x=4x = 4

Step 4: Substitute x=4x = 4 into the expression for yy

Substitute x=4x = 4 into equation (3):

y=2(4)3=83=5y = 2(4) - 3 = 8 - 3 = 5

Final Solution:

The solution to the system is: x=4,y=5x = 4, \quad y = 5

Would you like more details or have any further questions?

Here are 5 related questions to expand on this topic:

  1. Can you solve the same system using the elimination method?
  2. How does substitution differ from elimination in terms of strategy?
  3. What happens if the system of equations has no solution or infinitely many solutions?
  4. Can substitution be used for non-linear systems? If so, how?
  5. How can you check if your solution is correct for any system of equations?

Tip: After solving a system, always substitute the values back into the original equations to verify your solution.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Substitution Method
Systems of Equations

Formulas

y = 2x - 3
-2x + y = -3
5x - 3y = 5

Theorems

Substitution Method for solving systems of linear equations

Suitable Grade Level

Grades 8-10