Question

How substation y=3x-7 2y+4x=36

Answer 1

The solution is:

x = 5

y = 8

Step-by-step explanation:

Given equations are:

$y=3x-7\ \ \ Eqn\ 1\\2y+4y = 36\ \ \ Eqn\ 2$

Putting y = 3x-7 in equation 2

$2(3x-7)+4x = 36\\6x-14+4x = 36\\10x-14 = 36\\10x = 36+14\\10x = 50$

Dividing both sides by 10

$\frac{10x}{10} = \frac{50}{10}\\x = 5$

Putting x=5 in eqn 1

$y = 3(5)-7\\= 15-7 = 8$

Hence,

x = 5

y = 8

Keywords: Linear equation, substitution method

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