I don't get it at all 9÷917

How do you find x in a simultaneous equation thanks

Mekhanik [1.2K]

Answer:

Step 1: Multiply each equation by a suitable number so that the two equations have the same leading coefficient. ...

Step 2: Subtract the second equation from the first.

Step 3: Solve this new equation for y.

Step 4: Substitute y = 2 into either Equation 1 or Equation 2 above and solve for x.

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

Explain, how you can solve the pair of equations graphically. Wright the slope and y- intercept for each equation that you will

poizon [28]

You can solve the pair of equations graphically by finding where the two lines intersect/meet. The point where they intersect is the solution to both of the equations.

Slope-intercept form: y = mx + b

(m is the slope, b is the y-intercept, or the point where x = 0 ---> (0 , y))

y = 7x - 9

m = 7

y-intercept = -9 -----> (0, -9)

y = 3x - 1

m = 3

y-intercept = -1 ------> (0, -1)

I'm not really sure what the last sentence of the question is asking, so you could clarify the question if you need help

6 0

3 years ago

Consider triangle ABC with the measure of an angle B = 60ﾟ and sidelinks a equal 4 &c equal 5 what option listed is an expre

ivann1987 [24]

The law of cosine helps us to know the third side of a triangle when two sides of the triangle are already known the angle opposite to the third side is given. The correct option is B.

<h3>What is the Law of Cosine?</h3>

The law of cosine helps us to know the third side of a triangle when two sides of the triangle are already known the angle opposite to the third side is given. It is given by the formula,

$c =\sqrt{a^2 + b^2 -2ab\cdot Cos\theta}$

where

c is the third side of the triangle

a and b are the other two sides of the triangle,

and θ is the angle opposite to the third side, therefore, opposite to side c.

The length of the sidelink b using the cosine rule can be written as,

$b = \sqrt{a^2+c^2-2ac\cos(\angle B)}\\\\b = \sqrt{4^2+5^2 - 2(4)(5)(\cos 60^o)}\\\\b = \sqrt{16+25-20}$

Hence, the correct option is B.

The complete question is:

Consider ABC with the measure of angle B equal to 60 degrees, and side lengths a=4 and c=5. Which option lists an expression that is equivalent to the length of side b?

Options are given in the image below.

Learn more about the Law of Cosine:

brainly.com/question/17289163

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