Question

solve x and y x+2y=8, 2x+y=7

Answer 1

x +2y = 8-------(!)
2x+ y = 7-------(!!)
now,
(!)x 2 =) 2x+4y =16
!!) = 2x +y = 7
- - -
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subtracting. 3y =9
y= 3
put y=3 in (!!) we get
2x + 3 = 7
x. = 2

Answer 2

Concept Introduction:

A mathematical equation is a calculation that uses the equals sign to represent the equivalency of two expressions.

Solution:

Given,

$x+2y = 8\\2x+y = 7$

We have to solve $x$ and $y$

So, $( x + 2y)$ ×$2 = 8$×$2$

$2x+2y= 16$

By, subtracting the equations,

$2x+2y-2x-y = 16-7$

$y= 9$

By putting the value of $x$,

$2x+9=7$

$x=-1$

Final Answer:

The final answer is $x=-1 , y=9$

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