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3 years ago

14

I need to know how to do the systems of equation

1 answer:

belka [17]3 years ago

4 0

Answer: x = 3
y = -1

There are many ways to do the systems of equations. To solve this, I used the substitution method.

Isolate y or x (whichever is easier) in the first equation IF NECESSARY.
y = x - 4 --> it's already given

Substitute in (x - 4) for y in the second equation.
2x + (x - 4) = 5 Distributive Property
2x + x - 4 = 5 Combine like terms
3x - 4 = 5 Add 4 to both sides
3x = 9 Divide by 3 to both sides
x = 3 Answer!

Substitute in (3) for x in the first equation.
y = (3) - 4 Simplify
y = -1 Answer!

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Step-by-step explanation:

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2 years ago

The inequality x - y > 0 is satisfied by point (-1, 1).<br><br> T/F

Mekhanik [1.2K]

-2 is not greater than zero, so, the point don't satisfy the inequality x - y > 0

Hence correct option is false.

Step-by-step explanation:

We need to identify the point (-1,1) satisfies the inequality x - y > 0

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The value of x = -1 and y =1

Putting values in the inequality:

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Keywords: Solving inequalities

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7 0

3 years ago

Solve equation by completing the square round to the nearest hundredth if necessary <br> X2-4x-=5

kipiarov [429]

Answer:

x=-1 and x=5

Step-by-step explanation:

we have

$x^{2} -4x=5$

Solve it by completing the square method

We take the coefficient of x that is -4, divide it by 2 and then square it

so

$-\frac{4}{2}=-2$

square it

$(-2)^2 = 4$

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$x^{2} -4x+4=5+4$

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Rewrite as perfect squares

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take square root both sides

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therefore

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$x=2-3=-1$

6 0

3 years ago