Uhh help lol
5.3x + y = 28.5
4.2x + 3.1y = 27.2
find x and y

x = 5, y = 2

Step-by-step explanation:

First, isolate y in the top equation.

Next, substitute y in the bottom equation.

Simplify.

Combine like terms.

Isolate x on one side.

Isolate x.

Substitute x into

Simplify.

Isolate y.

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

brainliest

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92