1. Write the condition for which the pair of equations ax + 2y =7 and ...
Condition for Parallel Lines:Two lines are said to be parallel if they never intersect each other. In other words, they have the same slope but different y-intercepts. The condition for which the pair of equations ax + 2y = 7 and 3x + by = 16 represent parallel lines are:
Same Slopes:The slopes of the two lines must be equal for them to be parallel. The slope of the first line can be found by rearranging the equation into slope-intercept form:
ax + 2y = 7
2y = -ax + 7
y = (-a/2)x + 7/2
The slope of the first line is -a/2. Similarly, the slope of the second line can be found by rearranging the equation into slope-intercept form:
3x + by = 16
by = -3x + 16
y = (-3/b)x + 16/b
The slope of the second line is -3/b. Therefore, for the two lines to be parallel, -a/2 = -3/b, or:
a/b = 6
Different y-Intercepts:The two lines must have different y-intercepts for them to be parallel. The y-intercept of the first line can be found by setting x = 0:
ax + 2y = 7
2y = 7
y = 7/2
The y-intercept of the first line is 7/2. Similarly, the y-intercept of the second line can be found by setting x = 0:
3x + by = 16
by = 16
y = 16/b
The y-intercept of the second line is 16/b. Therefore, for the two lines to be parallel, 7/2 ≠ 16/b, or:
a ≠ 24
Conclusion:Therefore, the condition for which the pair of equations ax + 2y = 7 and 3x + by = 16 represent parallel lines are a/b = 6 and a ≠ 24.