The best question of class 10th math of pair of linear equations in two variables, of optional exercise 3.7 How i solve this question in easy way Solve the following pair of linear equations: (v) 152x – 378y = – 74 –378x + 152y = – 604
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Solve the following pair of linear equations: (v) 152x – 378y = – 74 –378x + 152y = – 604 Q.7(5)
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x =(189y-137)/76……………..…(i)
− 378x + 152y = − 604
− 189x + 76y = − 302 ………….. (ii)
Using the value of x in equation (ii), we get
−189(189y−37/76)+76y=−302
− (189)2y + 189 × 37 + (76)2 y = − 302 × 76
189 × 37 + 302 × 76 = (189)2 y − (76)2y
6993 + 22952 = (189 − 76) (189 + 76) y
29945 = (113) (265) y
y = 1
Using equation (i), we get
x = (189-37)/76
x = 152/76 = 2