Solve.
5x – 10 < 20

(-00, 2]
(-0,2)
(-0, 6]
(-0,6)

-infinity, 6

Step-by-step explanation:

5x - 10 <= 20

5x <= 30

x <= 6

(10/3, 2/3)

Step-by-step explanation:

You may find it easier to write these two equations x+y=4 2x-y=6 in a column:

x+y=4

2x-y=6

Adding these together will eliminate y:

3x = 10.  Then x = 10/3.

Substituting 10/3 for x in the first equation results in:

10/3 + y = 4

Clear fractions by multiplying all three terms by 3:

10 + 3y = 12

Then 3y = 2, and y = 2/3.

The solution is (10/3, 2/3)