2x-3y = 10
-2x + 3y=-10
How do you solve this equation?

This week, conrad will work 1 3/4 times longer than last week. giovanni will work 1 1/3 times longer than last week. sally will work 2/3 the number of hours she worked last week. match each employee's name to the number of hours he or she will work this week

Simplify the expression 10/11(22z) + (a+5) -1

How do you use the elimination method for this question? explain, because i really want to understand!