Question

20. Find the solution by the substitution method : x - 3y - 10 = 0 and x - 7y + 30 = 0​

Answer 1

Answer:

I just solved on paper cuz it take lot of time to type

Answer 2

The solution would be x = 40 and y = 10

Step-by-step explanation:

Given equations,

x - 3y - 10 = 0     ...(1)

x - 7y + 30 = 0​    ...(2)

In substitution method we find the value of one variable from one equation then put the value in second equation to find the solution.

From equation (1),

x = 3y + 10   ...(3)

Substitute the value in equation (2),

3y + 10 - 7y + 30 = 0

-4y + 40 = 0

-4y = -40

⇒ y = $\frac{-40}{-4}=10$

From equation (3),

x = 3(10) + 10 = 30 + 10 = 40

#Learn more :

Solve system of equations by elimination method :

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