Question

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

Answer 1

Answer:

1.a=5,b=-2

Step-by-step explanation:

2x+a=5-bx

divide by 2

$x+\frac{a}{2}=\frac{5}{2}+\frac{-b}{2}x\\for~ to~ have ~infinite ~solutions\\\frac{a}{2}=\frac{5}{2}\\a=5\\1=\frac{-b}{2}\\b=-2$

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°