4-9 graph each equation. 4. x+3y=7 5. 2s-t=4 6. a+b=-3 7. -2x+4y=6 8. m-2n=-2 9. 3/4x-1/4y=8

Each of given equations represent the straight line on the coordinate plane.

To plot each of these lines you should find x and y intercepts and then connect these two points by line.

1. For the equation when x=0, and when y=0, x=7. You get two points (0,7/3) and (7,0) (see first graph).

2. For the equation when s=0, and when t=0, s=2. You get two points (0,-4) and (2,0) (see second graph).

3. For the equation when a=0, and when b=0, a=-3. You get two points (0,-3) and (-3,0) (see third graph).

4. For the equation when x=0, and when y=0, x=-3. You get two points (0,3/2) and (-3,0) (see fourth graph).

5. For the equation when m=0, and when n=0, m=-2. You get two points (0,1) and (-2,0) (see fifth graph).

6. For the equation when x=0, and when y=0, You get two points (0,-32) and (32/3,0) (see sixth graph).

Note that last two graphs are in the same diagram.

e) none of the above because the measure of angle cba is 101°

x = 23.78

step-by-step explanation: