Graph the system of linear equations and then state how many solutions. Click Here for Help Video



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(b)
How many solutions does the system of linear equations have?


y
=
3
x
+
5
y=3x+5

y
=
3
x
+
2
y=3x+2

1 answer

To determine how many solutions the system of linear equations has, we start by analyzing the two equations provided:

  1. \( y = 3x + 5 \)
  2. \( y = 3x + 2 \)

Both equations are in slope-intercept form \( y = mx + b \), where \( m \) represents the slope and \( b \) the y-intercept.

Step 1: Identify the slopes and y-intercepts

  • For the first equation \( y = 3x + 5 \):

    • Slope (m) = 3
    • y-intercept (b) = 5
  • For the second equation \( y = 3x + 2 \):

    • Slope (m) = 3
    • y-intercept (b) = 2

Step 2: Analyze the lines

  • Both lines have the same slope (3), which means they are parallel.
  • Since the y-intercepts are different (5 for the first line and 2 for the second line), the lines will never intersect.

Conclusion

Since the lines are parallel, there is no point of intersection between them, and therefore:

  • The system of linear equations has no solutions.

Graphing

If you were to graph these two lines:

  • The line \( y = 3x + 5 \) would cross the y-axis at the point (0, 5).
  • The line \( y = 3x + 2 \) would cross the y-axis at the point (0, 2).

Both lines would increase at the same rate due to the slope of 3 but would never meet, confirming that there are no solutions.