Equation Alignment for Table Mapping of X and Y

Which of the following equations corresponds to the function represented in the table?

XY-125811246810

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the appropriate equation for the function in the table
00:04 We want to find the slope of the graph
00:07 We'll use the formula for finding the slope of a function graph
00:12 We'll substitute appropriate values according to the data and solve to find the slope
00:24 This is the slope of the graph
00:32 Let's take a point on the graph
00:36 We'll use the straight line equation
00:39 We'll substitute appropriate values and solve to find B
00:52 This is the value of B
00:56 We'll compose the straight line equation according to the values we found
01:03 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

Which of the following equations corresponds to the function represented in the table?

XY-125811246810

2

Step-by-step solution

To determine which equation corresponds to the function given by the table, we will test each equation using the (x,y) (x, y) pairs from the table. Specifically, we will verify which equation satisfies all pairs so that we can conclude it functions as desired.

Consider the equation y=23x+223 y = \frac{2}{3}x + 2\frac{2}{3} .

  • For x=1 x = -1 :

Substitute into the equation:
y=23(1)+223=23+83=63=2 y = \frac{2}{3}(-1) + 2\frac{2}{3} = -\frac{2}{3} + \frac{8}{3} = \frac{6}{3} = 2 . The value matches the table, y=2 y = 2 .

  • For x=2 x = 2 :

Substitute into the equation:
y=23(2)+223=43+83=123=4 y = \frac{2}{3}(2) + 2\frac{2}{3} = \frac{4}{3} + \frac{8}{3} = \frac{12}{3} = 4 . The value matches the table, y=4 y = 4 .

  • For x=5 x = 5 :

Substitute into the equation:
y=23(5)+223=103+83=183=6 y = \frac{2}{3}(5) + 2\frac{2}{3} = \frac{10}{3} + \frac{8}{3} = \frac{18}{3} = 6 . The value matches the table, y=6 y = 6 .

  • For x=8 x = 8 :

Substitute into the equation:
y=23(8)+223=163+83=243=8 y = \frac{2}{3}(8) + 2\frac{2}{3} = \frac{16}{3} + \frac{8}{3} = \frac{24}{3} = 8 . The value matches the table, y=8 y = 8 .

  • For x=11 x = 11 :

Substitute into the equation:
y=23(11)+223=223+83=303=10 y = \frac{2}{3}(11) + 2\frac{2}{3} = \frac{22}{3} + \frac{8}{3} = \frac{30}{3} = 10 . The value matches the table, y=10 y = 10 .

Thus, the equation y=23x+223 y = \frac{2}{3}x + 2\frac{2}{3} satisfies all pairs from the table, confirming it is the correct representation.

Therefore, the correct answer is y=23x+223 y = \frac{2}{3}x + 2\frac{2}{3} .

3

Final Answer

y=23x+223 y=\frac{2}{3}x+2\frac{2}{3}

Practice Quiz

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Determine whether the following table represents a constant function:

XY02468-3-3-3-3-3

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