Question

5x-4y=16;7x-4y=20


solve it​

Answer 1

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GIVEN EQUATION :

• 5x - 4y = 16 ....(i)
• 7x - 4y = 20 ....(ii)

SOLUTION :

• Substract Eq. (i) from (ii)

• (7x - 4y) - (5x - 4y) = 20 -1 6
• 7x - 4y - 5x + 4y = 4
• 2x = 4
• x = 4/2
• x = 2

• Putting the value of x in eq. i

• 5x - 4y = 16
• 5( 2) - 4y = 16
• 10 -4y = 16
• 4y = 16-10
• y = 4/4
• y = 1

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