Mathematics
For solving each pair of equations, use the method of elimination by equating coefficients :
41x + 53y = 135
53x + 41y = 147
Linear Equations
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Answer
Given, equations :
⇒ 41x + 53y = 135 ………(1)
⇒ 53x + 41y = 147 ………(2)
Multiplying equation (1) by 53, we get :
⇒ 53(41x + 53y) = 53 × 135
⇒ 2173x + 2809y = 7155 …….(3)
Multiplying equation (2) by 41, we get :
⇒ 41(53x + 41y) = 41 × 147
⇒ 2173x + 1681y = 6027 …….(4)
Subtracting equation (4) from (3), we get :
⇒ 2173x + 2809y - (2173x + 1681y) = 7155 - 6027
⇒ 2173x - 2173x + 2809y - 1681y = 1128
⇒ 1128y = 1128
⇒ y = = 1.
Substituting value of y in equation (1), we get :
⇒ 41x + 53y = 135
⇒ 41x + 53(1) = 135
⇒ 41x + 53 = 135
⇒ 41x = 135 - 53
⇒ 41x = 82
⇒ x = = 2.
Hence, x = 2 and y = 1.
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