std 10 maths-1 practice set 1.1 full solution | std10 maths-1 practice set 1.1

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Practice Set 1.1
(1) Complete the following activity to solve the simultaneous equations.
5x + 3y = 9 -----(I)
2x+3y = 12------(II)
Let's add eqations (I) and (II).
-
5x + 3y = 9
2x - 3y = 12
X = .. Solution is (x, y) =4
Place x = 3 in equation (I).
5 x+3y=9
3y = 9
2. Solve the following simultaneous equations.
(1) 3a + 5b = 26; a + 5b = 22
(3) 2x - 3y = 9; 2x + y = 13
(5) 5x + 2y = -3; x + 5y = 4
(7) 99x + 101y = 499; 101x + 99y = 501
(8) 49x =57y= 172; 57x - 49y = 252
(2) x + 7y =10; 3x - 2y = 7
(4) 5m - 3n = 19; m6n = -7 1101 11; 2x+y=
(6) ²/² x + y = ²/34=4
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