Question

Solve the following pair
pair of linear
equation by elimination method
2x + y = 5

x + 2y = -2​

Answer 1

Answer:

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Multiply equation 2 by 2

2(x + 2y) = 2(-2)

2x + 4y = -4

Subtract them

(2x + y) - (2x + 4y) = 5 - (-4)

2x + y - 2x - 4y = 5 + 4

y - 4y = 9

-3y = 9

y = 9/-3

y = -3

Now

By using 2

x + 2y = -2

x + 2(-3) = -2

x + (-6) = -2

x - 6 = -2

x = 6 - 2

x = 4

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Answer 2

Answer:

2x + y = 5 is an equation that will give sets of coordinates if you substitute different values of x and/or y into the equation. If you put when x = 0 and y = 0 in then you will get the points when the line crosses the x and y axes. Plot these two points on the axes and you will have your straight line.