Question

solve the pair of linear equations by substitution method (1) 4x - 7y = 23 (2) 5x + 2y = -25 ??​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

x = -3 , y = -5

Step-by-step explanation:

4x-7y = 23 .....(1).

4x = 23+7y

x =23+7y/4

now, putting the value of x =23+7y/4in EQ.(2)

5x+2y= -25

5(23+7y/4) +2y = -25

115+35y/4 + 2y = -25

115+35y+8y/4 = -25

115+43y = -25*4

115+43y = -100

115+100 = -43y

215 = -43y

y = -215/43

y = -5

now, putting the value of y = -5 in EQ. (1)

x =23+7(-5)/4

x = 23-35/4

x = -12/4

x = -3