the second angle of a triangle is three times as large as the first angle. the third angle is thirty degrees more than the first angle. Find the measure for the angles​

Which equation could represent the relationship shown in the scatter plot? y=−3x−2 y=−3/4x+10 y=−2/3x+1 y=9x−12 scatter plot with x axis labeled variable x and y axis labeled variable y. points go from upper left to lower right.