Answer:
E = 50
D = 150
Step-by-step explanation:
We know that the exterior angle is equal to the sum of the opposite interior angles
D + E = 200
D = 3E
Substituting that into the equation
3E + E = 200
Combing terms
4E = 200
Divide by 4
4E /4 = 200/4
E = 50
D = 3E
D = 3*50 = 150
Answer:

Step-by-step explanation:
Hi there!

To get rid of the fraction
, multiply both sides of the equation by 3 (the denominator):

To get rid of the fraction
, multiply both sides of the equation by 5 (the denominator):

I hope this helps!
Answer:
As there are 2 equations and two unknowns there is 1 solution
19 is the answer 4+5(3)= 4+15=19
You can use cross product to slove this equation.