Can someone help me do this

Mathematics

2 answers:

inessss [21]3 years ago

6 0

The 3 inside angles should add up to 180. The one next to the 130 is 50 degrees.

180 = 50 + (16x + 4) + (14x + 6)

180 = 30x + 60

120 = 30x

x = 4

Firlakuza [10]3 years ago

6 0

X = 4

First, we can see that the top angle is 130°, that means the other side of the angle is 50° because that straight line must equal 180°.

Next, we know that the inside of a triangle must equal 180°. We know that one of the angle’s is 50°, that means we need to plug in the numbers and solve the other angles until the total of all three angles is 180°.

If we plug in 4 for x, this is what we get…
14(4) + 6 = 62°
16(4) + 4 = 68°

Now we know all three angles, but we can add to check…
50° + 62° + 68° = 180°

Therefore, x = 4!

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In order to solve the following system of equations by addition, which of the

Pavlova-9 [17]

Answer:

Multiply the top equation by -3 and the bottom equation by 2

Step-by-step explanation:

Given system of equations:

$\begin{cases}4x-2y=7\\3x-3y=15 \end{cases}$

To solve the given system of equations by addition, make one of the variables in both equations sum to zero. To do this, the chosen variable must have the same coefficient, but it should be negative in one equation and positive in the other, so that when the two equations are added together, the variable is eliminated.

To eliminate the variable y:

Multiply the top equation by -3 to make the coefficient of the y variable 6:

$\implies -3(4x-2y=7) \implies -12x+6y=-21$