4. solve -3 = -2x + 1 by graphing.

x=2

Step-by-step explanation:

-3         =  -2x  +1

+3 +2x =  +2x +3

2x=4

divide them both by 2

x=2

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

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step-by-step explanation: