algebra
posted by S on .
I just need a quick check before I hand in my work if you would...Thanks.
1. I am to use the intercepts to graph the equation x+3y=6
I used the formula y=mx+b using 3 and 6 for x I got these as my ordered pairs to graph (3, 1), (6, 4)…Is this correct?
2. Multiply 2/1*(6/1): I got 12
3. Solve 3+4x<27 I got <6
4. Solve the compound inequality: 6>4x+5 or 9 <(or equal to)4x+2
My answer was (oo,7/4]u(1/4,oo)
5. Is (5, 2) a solution to 4x2y=6 I said no
7. Solve using elimination: 5r3s=11
3r+5s=61 I got (7, 8)
8. Graph using slope and y intercept: y=4/3x+3 I graphed (0, 3) and (3, 7)
9. Solve using elimination
2x+3y=1
4x+6y=2
I got 0…there is no solution

1. To use the intercepts, which are (x,y) = (0,2) and (6,0), you should have drawn a line through those points.
7. (7,8) does not satisfy the first equation
9. The equations are not independent. They represent the same line when plotted. There is no unique solution; there are actually an infinite number. All points along the line are solutions.