Question

Solve tje following pair of equations by substitution method
7x-15y=2
X+2y=3

Answer 1

Answer:

Step-by-step explanation:

x + 2y = 3

x = 3-2y -----(1)

Second equation ,

7x - 15y = 2

Put value of x from (1) ,

21 - 14y -15y = 2

- 29y = -19

y = 19/29

From (1)

x = -9/29

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Answer 2

Answer:

7x – 15y = 2 (1) x + 2y = 3 (2) Step 1: We pick either of the equations and write one variable in terms of the other. Let us consider the Equation (2) : x + 2y = 3 and write it as x = 3 – 2y

7x – 15y = 2 (1) x + 2y = 3 (2) Step 1: We pick either of the equations and write one variable in terms of the other. Let us consider the Equation (2) : x + 2y = 3 and write it as x = 3 – 2y Step 2 : the value of x in Equation (1). We get 7(3 – 2y) – 15y = 2 i.e., 21 – 14y – 15y = 2 i.e., – 29y = –19 Therefore, y =19/29