Help please find the value of x, y and a for 6 and 7

Polygon mnopq is dilated by a scale factor of 0.8 with the origin as the center of dilation, resulting in the image m′n′o′p′q′. the coordinates of point m are (2, 4), and the coordinates of point n are (3, 5). the slope of is .

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept