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3 years ago

Find the values of x and y. 18. 120°=(2x + y)° (2x - y)°=140°

Mathematics

1 answer:

sleet_krkn [62]3 years ago

8 0

Answer:

x = 65, y = - 10

Step-by-step explanation:

Given the 2 equations

2x + y = 120 → (1)

2x - y = 140 → (2)

Adding the 2 equations term by term will eliminate y, that is

4x = 260 ( divide both sides by 4 )

x = 65

Substitute x = 65 into either of the 2 equations and evaluate for y

Substituting into (1)

2(65) + y = 120

130 + y = 120 ( subtract 130 from both sides )

y = - 10

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2 years ago

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3 years ago

Evaluate the expression below when x=-1. 2x^2-5/x+9

Greeley [361]

Hey there!

2x^2 - 5 / x + 9

= 2(-1)^2 - 5/ -1 + 9
= (2(-1)^2 - 5) / (-1 + 9)

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Therefore, your answer is:

-3/8 OR -0.375

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2 years ago

The difference between a number and five equals three. Translate this sentence to an equation and then find the

laila [671]

Answer:

the equation will be:

$\mathbf{x-5=3}$

solving the equation we get x=8

Option B is correct.

Step-by-step explanation:

We need to write equation for this sentence:

The difference between a number and five equals three.

Let number = x

So, the equation will be:

$\mathbf{x-5=3}$

Now, solving the equation to find value of x

$x-5=3$

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3 years ago

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