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crimeas [40]
3 years ago
6

Which order pair is a solution of the equation y= x -2

Mathematics
2 answers:
boyakko [2]3 years ago
8 0
(3,1) y= x -2, <span> when x = 3, y = 3 -2 = 1 ....YES
</span>(1,3) y= x -2 , when x = 1, y = 1 -2 = -1 ....NO
(-1,3) y= x -2 , when x = -1, y = -1 -2 = -3 ....NO
(3,-1) y= x -2 , when x = 3, y = 3 -2 = 1 ....NO

answer is 
<span>A-(3,1)</span>
Ainat [17]3 years ago
5 0
The easiest way to solve this problem is to start plugging in the values for y and x.

For "A" you have an x-value of 3 and a y-value of 1.  Plug these in and you get:

1 = (3) - 2.

Subtract.

1 = 1

Because this statement is true, "A" is a solution to the equation y = x - 2.

"A" is the answer.

If we were to try something else though, such as "B", we would end up with a false statement.

"B" has an x-value of 1 and a y-value of 3.

3 = (1) - 2

Subtract.

3 = -1

This statement is false, therefore, "B" is not a solution to the equation y = x - 2.
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Find ML, JK=3x+11, ML=10x-12, NP=45
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Answer:

ML = 58

Step-by-step explanation:

Given

JK=3x+11, ML=10x-12, NP=45

See attachment

Required

Length ML

First, calculate x using the following equivalent ratios

JK : NP = NP : ML

Express as fraction

\frac{JK }{ NP} = \frac{NP }{ ML}

Cross Multiply

JK * ML = NP * NP

Substitute values:

(3x +11) * (10x - 12) = 45 * 45

Expand

30x^2 - 36x + 110x - 132 = 2025

30x^2 +74x - 132 = 2025

Collect like terms

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Using a calculator:

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Given that:

ML=10x-12

Substitute values for x

ML=10*-10-12 = -100 - 12 = -112

ML=10*7-12 = 70 - 12 = 58

ML cannot be negative; So:

ML = 58

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