Question

Answer both correctly and I’ll give golden brain c:

Answer 1

1.a=5,b=-2

Explanation:

2x+a=5-bx

divide by 2

`x+(a)/(2)=(5)/(2)+(-b)/(2)x\\for~ to~ have ~infinite ~solutions\\(a)/(2)=(5)/(2)\\a=5\\1=(-b)/(2)\\b=-2`

or

equate the coefficients of like terms

-b=2

b=-2 (coefficient of x)

a=5 (constant terms)

2.

72°

external angle= sum of two opposite internal angles.

∠2=42+30=72°