Math Problem Statement

Solve the system of equations: y = 45x + 29 and y = x^2 + 49x - 16.

Solution

The problem asks to solve the system of equations:

  1. y=45x+29y = 45x + 29
  2. y=x2+49x16y = x^2 + 49x - 16

Step 1: Substitute yy from the first equation into the second equation

Since both equations are equal to yy, set them equal to each other:

45x+29=x2+49x1645x + 29 = x^2 + 49x - 16

Step 2: Rearrange the equation

Reorganize all terms to one side of the equation:

x2+49x1645x29=0x^2 + 49x - 16 - 45x - 29 = 0

Simplify:

x2+4x45=0x^2 + 4x - 45 = 0

Step 3: Solve the quadratic equation

The quadratic equation is:

x2+4x45=0x^2 + 4x - 45 = 0

We solve it using factoring, if possible. The factors of 45-45 that add to 44 are 99 and 5-5:

(x+9)(x5)=0(x + 9)(x - 5) = 0

Thus, the solutions for xx are:

x=9orx=5x = -9 \quad \text{or} \quad x = 5

Step 4: Solve for yy

Substitute x=9x = -9 and x=5x = 5 into the first equation (y=45x+29y = 45x + 29) to find the corresponding yy-values:

  1. For x=9x = -9: y=45(9)+29=405+29=376y = 45(-9) + 29 = -405 + 29 = -376

  2. For x=5x = 5: y=45(5)+29=225+29=254y = 45(5) + 29 = 225 + 29 = 254

Final Answer:

The solutions to the system are:

(x,y)=(9,376)and(x,y)=(5,254)(x, y) = (-9, -376) \quad \text{and} \quad (x, y) = (5, 254)

Would you like a step-by-step verification of this solution or help with graphing?

Here are 5 follow-up questions:

  1. How would you graphically represent these solutions on a coordinate plane?
  2. What does it mean when two equations in a system share these points?
  3. Can we solve this system using a different method, such as substitution or elimination?
  4. What happens if the quadratic equation cannot be factored?
  5. How do we determine whether the solutions are correct for both equations?

Tip: Always substitute your solutions back into the original equations to verify their correctness!

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Math Problem Analysis

Mathematical Concepts

Systems of Equations
Quadratic Equations
Factoring

Formulas

y = mx + b (linear equation)
Quadratic equation: ax^2 + bx + c = 0

Theorems

Zero Product Property

Suitable Grade Level

Grades 9-11