Which line has a constant of proportionality between y and x of 5

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Pls brainliest will be awarded if answer is correct

Aline passes through the point (9,-7) and has a slope of 4/3 write an equation in point-slope form for this line. first to answer correctly gets brainleist