Which ratios form a proportion?
4/10 and 10/25
3/5 and 9/25
4/11 and 6/13
4/9 and 9/4​

4/10 and 10/25 ok

3/5 and 9/25 not ok

4/11 and 6/13 not ok

4/9 and 9/4​ not ok

Step-by-step explanation:

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,