Final answer:
The slope of the line perpendicular to the one with a slope of -5/7 is 7/5. This is because perpendicular lines have slopes that are negative reciprocals of each other.
Step-by-step explanation:
If two lines are perpendicular, the slope of one line is the negative reciprocal of the other. The negative reciprocal is found by flipping the fraction and changing the sign. For a line with a slope of -5/7, the slope of a line perpendicular to it would be 7/5 (negative reciprocal).
In the context of a line graph with an algebra equation such as y = mx + b, where m represents the slope and b represents the y-intercept, the steepness and direction of the line are determined by the slope m. For instance, if Line A has a slope of -4.7, it is a line with a steep negative slope, whereas if Line B has a slope of 12.0, it indicates a steep positive slope.