Based on the image you sent, the expression that cannot be used to find the y-intercept is: m The line's slope (m) tells you how steep it is, but not where it crosses the y-axis (when x is 0). So, unlike all the other options, m can't help you find the y-intercept! Think of it like knowing the hill's slant, but not its starting point at the bottom.
The y-intercept of a graph is the point where the line crosses the y-axis. This happens when the x-value is 0.
The expression m represents the slope of the line. The slope tells you how much the line slants up or down as you move along it, but it doesn't tell you anything about the line's intersection with the y-axis (when x is 0).
The other expressions in the image, either directly contain the y-value (like y-mx) or involve quantities related to the y-intercept (like C/A and C/B). Therefore, they can all be used to find the y-intercept in some way.
So, while all the other expressions provide some information about the y-intercept, m only tells you about the line's slope and doesn't help you pinpoint where it crosses the y-axis.
complete question should be :
Which expression among the provided options, including y-mx, C/A, C/B, and m, cannot be employed to ascertain the y-intercept of a line y = mx + c ?