Question

By applying substitution and elimination ways, find solution of the following linear equations:
3x + y = 7
5x - 3y = 7

Answer 1

Answer:by substitution x=7-y/3

Put it in equation 2

35-5y/3 - 3y = 7

35-5y -9y = 21

-14y = - 14

Y=1 x=2

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Step-by-step explanation:

Answer 2

Substitution:

3x + y = 7

y = 7 - 3x

5x -3(7-3x)= 7

5x - 21 + 9x= 7

14x = 28

x = 2

3(2) + y = 7

Y = 1

Elimination:

5(3x) + 5(y)= 5(7)

15x + 5y = 35

3(5x) - 3(3y) = 3(7)

15x - 9y = 21

From eliminating the equations :

X = 2 and Y = 1