Solve the system of equations below :

(5,-4)

Step-by-step explanation:

Solve the equation for x and y

Solve the first equation for y

Subtract 4x on both sides

Now plug in -4x+16 for x in second equation

Subtract 48 on both sides

Divide both sides by -10

x=5

Plug in 5 for x in first equation

Solution is (5,-4)

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180