Can anybody help me on these 2 problems.

In which source of water would a wave travel the fastest? o ice o cold o room temperature o hot mark this and return save and exit next

Find the equation of the line that goes through the points (4, –1) and (2, –5). use slope formula,equation,to find the slope of a line that passes through the points. m = use slope-intercept form, y = mx + b, to find the y-intercept (b) of the line. b = write the equation in slope-intercept form, y = mx + b.

Find an equation for the linear function which has slope -10 and x-intercept -7