Question

-2x-7y = 30 and 7x+ 4y= 18 find the value x and y ​

Answer 1

Answer:

y = -6

x = 6

Step-by-step explanation:

-2x-7y =30

-2x = 30+7y

x= (30+7y)/-2      ~1

7x+4y = 18

substitute the value of x in terms of y found in the first equation

7$\frac{(30+7y)}{-2}$ + 4y = 18

$\frac{(210 + 49y)}{-2}$ +4y= 18

$\frac{(210 + 49y)}{-2}$ + $\frac{-8y}{-2}$ = 18

$\frac{210+49y-8y}{-2}$ = 18

transpose (-2) to the other side

210 + 41y = 18*-2

210+ 41y = -36

41y = -36-210

41y = -246

y = -246/41

hence, y = -6

            x = 6   (30-42/-2)

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