Respuesta :

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6x + 2 + 40 = 90

Let x = the unknown

6x + 42 = 90

6x = 90 - 42

6x = 48

x = 48/6

x = 8

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Answer:

x=8

Step-by-step explanation:

We know that 40 + (6x+2)  +90 = 180   since the three angles form a straight line

40 + (6x+2)  +90 = 180

Combine like terms

132 + 6x = 180

Subtract 132 from each side

132-132 +6x= 180-132

6x = 48

Divide each side by 6

6x/6 = 48/6

x = 8

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