Answer:
a = 14°
b = 46°
Explanation:
in order to get the value of a and b
we have,
3a + 4 + 134 =180 ........................................................... angle on a straight line
3a + 1 38 = 180
3a = 180 - 138
3a = 42
divide both sides by 3
3a/3 = 42/3
a = 14°
in order to get b lets substitute the value of a into its angle to know the value of angle a
(3a + 4)°
3(14) + 4
42 + 4
46°
to get the value of b
2b + 42 + 46 = 180................................................................... angle on a straight line
2b + 88 = 180
2b = 180 -88
2b = 92°
divide both sides by 2
b = 46°