Question

8) If 2x + y = 5 and 3x - y = 5
then x=​

Answer 1

STEP i) -

• Write equation as given.

STEP ii) -

• Add equation , if it has opposite sign. eg., (+) (-) = (+) and (-) (+) =(+)

• Subtract equation, if it has same sign. eg., (+) (+) =(-) and (-) (-) =(-)

• Here, Equation has opposite sign so that we added equation(i) and equation (ii) .

STEP iii) -

• Here, We need to know some Multiplication rules.

• (-) (-) = (+)

• (+) (+) = (+)

• (+) (-) = (-)

• (-) (+) = (-)

• As (+)(+) = (+) we've added +2x and +3x = +5x , (+) (-) = (-) so we cut +y -y and +5+5 =+10.

• Now, separate 5x and divide it by 10 .
• that is, x = 10/5 = 2

*Your Answer is x = 2*

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