Question

x+y=7 & 5y+12y=7 sovle by substitution method ​

Answer 1

x+y = 7..... 1

5y + 12 y =7..... 2

Simplifying

5Y + 7 = 12Y + 7

Reorder the terms:

7 + 5Y = 12Y + 7

Reorder the terms:

7 + 5Y = 7 + 12Y

Add '-7' to each side of the equation.

7 + -7 + 5Y = 7 + -7 + 12Y

Combine like terms: 7 + -7 = 0

0 + 5Y = 7 + -7 + 12Y

5Y = 7 + -7 + 12Y

Combine like terms: 7 + -7 = 0

5Y = 0 + 12Y

5Y = 12Y

Solving

5Y = 12Y

Solving for variable 'Y'.

Move all terms containing Y to the left, all other terms to the right.

Add '-12Y' to each side of the equation.

5Y + -12Y = 12Y + -12Y

Combine like terms: 5Y + -12Y = -7Y

-7Y = 12Y + -12Y

Combine like terms: 12Y + -12Y = 0

-7Y = 0

Divide each side by '-7'.

Y = 0

Simplifying

Y = 0

Answer 2

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