I seriously dont know what the answers are for these, can anyone help?

9. x = 5

10. m∠Y = 34°

Step-by-step explanation:

9.

Remember that congruent sides have congruent angles as well. That means 9x + 1 will be shown up in our equation twice. And as always, all angles in a triangle add up to 180.

2(9x + 1) + 88 = 180

18x + 2 + 88 = 180

18x + 90 = 180

18x = 90

x = 5

10.

The same concept applies here in question 10. Congruent angles and sides match each other. Therefore,

Step 1:

6x - 23 = 4x + 9

2x - 23 = 9

2x = 32

x = 16

Step 2:

Now that you have found x, plug it back into the given equations and find the other angle.

6(16) - 23 = 73

4(16) + 9 = 73

180 - (73)(2) = 34

4

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