Q4 of 92 Page 73

Let us solve the following simultaneous equations in two variables by the method of substitution and check whether the solutions satisfy the equations.


Given … (1)


And … (2)


Expressing x of equation (2) in terms of y,



… (3)


Substituting (3) in (1),











Substituting y value in (3),






∴ x = 1/2


∴ By solving, we get x = 1/2 and


Justification:


(1) -






And (2) -





∴ We can see that x = 1/2 and satisfy the equations (1) and (2).


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