Question

Solve the pairs of linear (simultaneous) equations by the method of elimination by substitution:

2x - 3y = 7

5x + y= 9​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

x=2 , y=(-1)

Step-by-step explanation:

2x-3y=7

2x=7+3y

x=(7+3y)/2 -----------(1)

5x+y=9 --------------(2)

PUTTING 'x' from equation(1) in equation(2):-

5[(7+3y)/2]+y=9

(35+15y)/2 + y=9

Taking the LCM:-

(35+15y+2y)/2=9

35+17y=18

17y=18-35=(-17)

y=(-17)/17

y=(-1)

5x+y=9

5x-1=9

5x=9+1=10

x=10/5

x=2