Question

7. Solve the system of equations: 3x – 7y + 10 = 0, y - 2x – 3 = 0
8. Solve the system of equations: 0.4x + 0.3y = 1.7, 0.7x - 0.2y = 0.8​

Answer 1

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Answer 2

Answer:

x = -1

y = 1

Step-by-step explanation:

3x - 7y +10 = 0  =>  3x -7y = -10---- eqn 1

y - 2x - 3    = 0  => -2x + y =    3-----eqn 2

                                       3x - 7y = -10

eqn 2 multiply by 7 => -14x + 7y = 21

                                     - 11x        = 11

                                          x        = -1

Let x = -1 in eqn 1, we get -7y = -10 + 3

                                          -7y = -7

                                              y = 1