Answered

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2x+y=21;y=-2x+21please hurry I need this straight away use any method

Sagot :

Answer:

(k, -2k+21) where k is any integer

Explanation:

Given the following simultaneous equation;

2x+y=21 ..... 1

y=-2x+21 ..... 2

Subtitute equation 2 into 1:

2x + (-2x+21) = 21

2x -2x+21 = 21

0x = 21-21

0x = 0

x = 0/0

Since the variables cannot be determined, we will subtitute x = k

Substitute x = k into equation 2;

From 2: y = -2x+21

y = -2k+21

Hence the solution to the system of equation is (k, -2k+21) where k is any integer

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