Math Problem Statement

Select all the correct answers. The table shows the balance of Steven's savings account over time. Assuming there are no withdrawals, if you graph the relationship for Steven's monthly balances, which points will lie on the resulting line?

Month Balance 1 $400 3 $1,200 7 $2,800 9 $3,600 13 $5,200 (22, 8,400) (23, 9,200) (24, 8,800) (26, 10,400) (27, 10,600)

Solution

To determine which points will lie on the resulting line representing Steven's savings account balance over time, we need to find the linear relationship between the month and the balance. We can do this by calculating the slope and the y-intercept from the given data points and then checking if the other points fit this linear equation.

First, let's find the slope (m) of the line. We'll use the points (1, 400) and (3, 1200):

m=120040031=8002=400m = \frac{1200 - 400}{3 - 1} = \frac{800}{2} = 400

Now that we know the slope is $400 per month, we can find the y-intercept (b) using the point (1, 400):

400=400(1)+b400 = 400(1) + b b=400400b = 400 - 400 b=0b = 0

The equation of the line is:

Balance=400×Month\text{Balance} = 400 \times \text{Month}

Now, we need to check if the points (22, 8400), (23, 9200), (24, 8800), (26, 10400), and (27, 10600) lie on this line:

  1. For (22, 8400): 400×22=8800400 \times 22 = 8800 840088008400 \neq 8800

  2. For (23, 9200): 400×23=9200400 \times 23 = 9200 9200=92009200 = 9200

  3. For (24, 8800): 400×24=9600400 \times 24 = 9600 880096008800 \neq 9600

  4. For (26, 10400): 400×26=10400400 \times 26 = 10400 10400=1040010400 = 10400

  5. For (27, 10600): 400×27=10800400 \times 27 = 10800 106001080010600 \neq 10800

Therefore, the points (23, 9200) and (26, 10400) will lie on the resulting line.

Would you like more details or have any questions about this?

Here are 5 numbered questions you can ask:

  1. How do you find the slope of a line from a table of values?
  2. What is the process for finding the y-intercept of a linear equation?
  3. How do you graph a linear equation on a coordinate plane?
  4. How can you check if a point lies on a given line?
  5. What are the applications of linear equations in real life?

Tip: To verify if a point lies on a line, substitute the point's coordinates into the line's equation and see if the equation holds true.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Slope
Y-intercept

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Linear equation: y = mx + b

Theorems

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Suitable Grade Level

Grades 7-9