morgannwaldrupp

07.11.2019 •

Mathematics

The ratio of 25 and a nonzero number

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Ответ:

bre2795

14.07.2020

Mathematics

$x = \frac{39}{2}$

$y = -\frac{29}{2}$

Step-by-step explanation:

Given

x + y= 5 --- (1)

7x + 9y = 6 ---- (2)

Required

Find x and y

Make x the subject in (1)

x + y= 5

x = 5 - y

Substitute 5- y for x in (2)

7x + 9y = 6

7(5 - y) + 9y = 6

Open bracket

35 -7 y + 9y = 6

Collect like terms

-7y + 9y = 6 - 35

2y = -29

Divide both sides by 2

$y = -\frac{29}{2}$

Substitute this for y in x = 5 - y

$x = 5 - (-\frac{29}{2})$

$x = 5 +\frac{29}{2}$

L.C.M

$x =\frac{10+29}{2}$

$x = \frac{39}{2}$

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