Identify the Correct Equation: Linking X and Y with Table Data

Question

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

XY-404812-3-2-101

Video Solution

Solution Steps

00:00 Find the appropriate equation for the function in the table
00:03 We want to find the slope of the graph
00:07 We'll use the formula to find the function's graph slope
00:12 We'll substitute appropriate values according to the data and solve to find the slope
00:20 This is the slope of the graph
00:27 Let's take a point on the graph
00:31 We'll use the linear equation
00:35 We'll substitute appropriate values and solve to find B
00:47 This is the value of B (Y-axis intercept)
00:50 We'll construct the linear equation using the values we found
00:54 And this is the solution to the question

Step-by-Step Solution

To determine the correct function, we first observe the changes in X X and their corresponding changes in Y Y . This can help us establish the slope of the function.

Let's calculate the slope m m using two points from the table. From X=4 X = -4 to X=0 X = 0 , Y Y changes from -3 to -2, resulting in a change of 1 in Y Y and 4 in X X . Hence the slope m=14 m = \frac{1}{4} .

Now, let's use the point (0,2) (0, -2) to find the y-intercept c c in the equation y=mx+c y = mx + c . Substituting m=14 m = \frac{1}{4} and point (0,2) (0, -2) in, we solve for c c :

2=14(0)+c -2 = \frac{1}{4}(0) + c
c=2 c = -2

This gives us the equation y=14x2 y = \frac{1}{4}x - 2 .

Let's verify this equation against other points in the table:

  • For X=4 X = 4 : y=14(4)2=12=1 y = \frac{1}{4}(4) - 2 = 1 - 2 = -1 . ✓
  • For X=8 X = 8 : y=14(8)2=22=0 y = \frac{1}{4}(8) - 2 = 2 - 2 = 0 . ✓
  • For X=12 X = 12 : y=14(12)2=32=1 y = \frac{1}{4}(12) - 2 = 3 - 2 = 1 . ✓

All table values satisfy the equation y=14x2 y = \frac{1}{4}x - 2 .

Therefore, the function that corresponds to the table is: y=14x2 y = \frac{1}{4}x - 2 .

Answer

y=14x2 y=\frac{1}{4}x-2