Question 19076
First you find the slope in the formula y2-y1/x2-x1.(1,2) are points 1.(21,-58) are points 2. Now you subsitute it so it would be -58-2/21-1, -60/20, 
-6/2,-3. -3 would be your slope so now you put it into slope intercept form which is y=mx+b. Since now you want to find the y-intercept you plug in the equation points and the slope. 2=-3(1)+b, 2=-3+b. Now you add both sides by 3 because you want to get the b alone so then b=5. Now have the slope intercept equation which is y=-3x+5. Now to get the standard form you add 3x to both sides so the answer would be 3x+y=5.