Question

how to solve equation In two variable
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Answer 1

Step-by-step explanation:

An equation with 2 unknowns can't be solved.

Long answer: You can only solve these type of equations when 2 or more than 2 equations are given (by Substitution, Matrices,etc.)

We will solve this by simple substitution (BTW you don't know about Matrices)

Ques.1 : solve for x and y by the given equations: (i) x=2y (ii) 3x+4y =250

Ans- in 3x +4y=250, let's substitute 4y by some multiple of x

Since 1x =2y, let's multiply both sides of this equation by 2, we get

2*1x=2*2y which equals 4y=2x

Now we can substitute 4y with 2x,

3x +2x =250

= 5x = 250 [Combine like terms]

5x/5 = 250/5. [Divide by 5 on both sides]

We get

x = 50

Since we know that x=2y,

50 =2y

= 50/2=2y/2 [Divide by 2 on both sides]

We get

y = 25

Hope it helps◉‿◉