Question

Solve: 3х + 2y = 16; 7х + y = 19 *

a) x = 2, y = 5
b) x = 2, y = -5
c) x = -2, у = -5
d) x = -2, y = 5​

Answer 1

Answer:

a) x = 2, y = 5

Step-by-step explanation:

   3x+2y=16------------eqn 1

 7x+y=19   --------------eqn 2

  from eqn 2

y=19-7x -------------eqn 3

put eqn 3 into eqn 1  

⇒  3x+2(19-7x)=16

3x+38-14x=16

-11x=16-38

-11x=-22

x=2

put x into eqn 3

y=19-7x

y=19-14

y=5

x=2, y=5

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