Respuesta :

limruisiang2007

Answer:

1. 21x+6 = 90 becuz all are straight lines. thus

21x=90-6

x = 84 ÷ 21 = 4

2. 23x-5=21x+5 becuz of corresponding angle.

thus 23x-21x = 5+5

2x = 10

x=5

3. 20x+5 + 24x-1 = 180 becuz of interior angles.

44x + 4 = 180

44x = 176

x = 176÷44=4

lizardot34

Answer:

1) x=4

Step-by-step explanation:

set 21x+6 equal to 90 -> 21x+6=90

Move 6 over to the right -> 21x=90-6

Subtract 90 from 6 -> 84 -> 21x=84

Divide by 21 on both sides -> x=4

That's the only one I remember how to do. I'm sorry I couldn't help more!

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