4x+6y= 10 -10x+2y= −8

x=1, y=1

Step-by-step explanation:

To solve the equations, we first have to label them.

4x +6y= 10 (1)

-10x +2y= -8 (2)

From (1): 2x +3y= 5 (3)

From (2):

-5x +y= -4

y= 5x -4 (4)

Subst. (4) into (3):

2x +3(5x -4)= 5

2x +15x -12= 5 (expand)

17x= 12 +5 (simplify, +12 on both sides)

17x= 17 (simplify)

x= 17 ÷17

x= 1

subst. x=1 into (4):

y= 5(1) -4

y= 5 -4

y= 1

all teachers

step-by-step explanation:

< 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⭐