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cluponka [151]
4 years ago
5

-90 times the difference between a number and 83 is equal to the number plus -99

Mathematics
1 answer:
dimaraw [331]4 years ago
7 0

Answer:

x = 83.2

Step-by-step explanation:

Let the unknown number be x

-90 * (x - 83) = x + (-99)

-90x + 7470 = x - 99

Subtract x from both sides

-90x - x + 7470 = x - x - 99

-91x + 7470 = -99

Subtract 7470 from both sides

-91x + 7470 - 7470 = -99 -7470

-91x = -7569

Divide both sides by -91

x = 83.2

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According to HL theorem if one leg and hypotenuse of one right triangle are equal to one leg and hypotenuse of other right triangle, then the triangles are congruent.

By using this theorem we can set up the system of equations as follows:

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By using equation (1) next step is to plug in y+1 for x in equation (2). So,

2 ( y + 1) + 3 = 3y + 3

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So, x=3 and y=2 make these triangles congruent.

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