Determine if the given ordered pairs are solution of x+ 4y = 7. 1. (3,1)
Solutions:

True

Step-by-step explanation:

3 X 1 = 3

4 X 1 = 4

3 + 4 = 7

Hope this helps!

(3, 1) is a solution

Step-by-step explanation:

If the coordinates are solutions of the equation, you should be able to solve the equation to get the y-value when you input the x-value;

So in the case of (3, 1), input x = 3 and solve for y:
(3) + 4y = 7

4y = 4

y = 1

Solving the equation gives y = 1, which is the same as the given coordinates, hence it is a solution or,  in other words, this point falls on the line graphed by the equation

angle addition postulate

2x=56

step-by-step explanation:

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet