3 years ago

Help me answer this question

1 answer:

7 0

This question is simple as all we must find is the area of the room. To find the area of a quadrilateral, we should multiply the length by the width. In this case, that is 10 and 5.

10
x5
50

Using the math above, we can see that Mary needs 50 square yards of carpet to cover the entire dining room floor.

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7x + 8y = 25 9x + 10y =35 elimination method please

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$7x +8y = 25 ~~~....(i)\\\\9x +10y = 35~~~ ....(ii)\\\\\text{Multiply equation (ii) by}~ \dfrac 79 ~ \text{and do (ii) - (i):}\\\\\dfrac 79 (9x +10y) - (7x +8y) = \dfrac 79 (35) - 25\\\\\\\implies 7x +\dfrac{70y}9 - 7x -8y = \dfrac{245}9 -25\\\\\\\implies - \dfrac{2y}9 = \dfrac{20}9\\\\\\\implies -2y =20\\\\\implies y =-10\\\\\text{Substitute}~ y = -10~ \text{in equation (i):}\\\\\\7x +8(-10) = 25\\\\\implies 7x = 25 +80\\\\\implies 7x = 105 \\\\\implies x =15\\\\$