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THE FIGURE SHOWDSS ANGLE ABD IS 90° SLIPT BY LINE BC . THE MEASURE OF ANGLE ABC IS X ° AND THE MEASUREMENT OF DBC (3X+10) . WHAT IS THE VALUE OF X . ENTER YOUR ANSWER IN THE BOX

THE FIGURE SHOWDSS ANGLE ABD IS 90 SLIPT BY LINE BC THE MEASURE OF ANGLE ABC IS X AND THE MEASUREMENT OF DBC 3X10 WHAT IS THE VALUE OF X ENTER YOUR ANSWER IN TH class=


Answer :

From the picture,

∠ABC + ∠DBC = ∠ABD

Substituting with data,

x + (3x + 10) = 90

4x + 10 = 90

4x = 90 - 10

4x = 80

x = 80/4

x = 20

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