Math Problem Statement

Solve the linear-exponential system of equations by graphing on your own paper. Express your values as decimals rounded to the nearest hundredth, if necessary. y = (7/3)x + 1 y = 2^x

Solution

To solve this system of equations by graphing, we have:

  1. A linear equation:
    y=73x+1y = \frac{7}{3}x + 1

  2. An exponential equation:
    y=2xy = 2^x

The solution to this system is the point(s) where these two graphs intersect.

Step-by-Step Solution:

  1. Graph the Linear Equation:

    • The equation y=73x+1y = \frac{7}{3}x + 1 is a straight line with a slope of 73\frac{7}{3} and a y-intercept at (0,1)(0, 1).
    • This means that for every unit increase in xx, yy increases by about 2.332.33 units.
  2. Graph the Exponential Equation:

    • The equation y=2xy = 2^x is an exponential curve with a base of 2.
    • As xx increases, yy grows rapidly, while as xx decreases, yy approaches zero but never reaches it.
  3. Find the Intersection:

    • To solve this graphically, plot both equations on the same set of axes.
    • Look for the point(s) where the line and the curve intersect.

By graphing (or using a graphing calculator), you should find that these two equations intersect at approximately: (x,y)(0.39,1.31)(x, y) \approx (0.39, 1.31)

Thus, the solution to the system is: x0.39,y1.31x \approx 0.39, \quad y \approx 1.31

Would you like a detailed breakdown of graphing techniques or more insight into exponential versus linear functions?

Follow-up Questions:

  1. How do you interpret the slope of the linear function in this context?
  2. What are the key characteristics of exponential growth seen in y=2xy = 2^x?
  3. Why does the exponential function y=2xy = 2^x intersect the linear function only once in this case?
  4. How could you solve this system algebraically instead of graphically?
  5. What other types of functions could intersect exponentially growing functions?

Tip:

When solving systems involving exponential functions, consider the behavior of the curve as xx approaches both positive and negative infinity. This helps predict potential intersections.

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Math Problem Analysis

Mathematical Concepts

Algebra
Graphing
Linear Equations
Exponential Equations

Formulas

y = (7/3)x + 1
y = 2^x

Theorems

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Suitable Grade Level

Grades 9-11