Respuesta :

CastleRook
Given that vsr=8x+18, the value of x that that will make r is perpendicular to vs can be obtained as follows;
let:
vsr=8x+18=90
solving for x we get:
8x+18=90
8x=90-18
8x=72
x=72/8
x=9
The answer is x=9

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