How do I reduce a shape using the scale factor 2:1

Question 101 points)which equation in slope-intercept form represents the line that passes through (5, 1) and(-4,7)

Given abcd ac=38 and ae=3x+4 find the value of x

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists