Question

solve the system of equation by using the elimination method x+y=7 and 5x+12y=7​

Answer 1

Answer:

x+y=7 -------------eq1

5x+12y=7 ------------eq2

Multiplying eq1 by 5

5(x+y=7)

5x+5y=35 -----------eq3

solving eq2 and eq3

5x+12y=7

5x+5y=35

(-) (-) (-)

-----------------

7y= (-28)

y= (-4)

substituting the value y in eq1

x+(-4) =7

x= 7+4

x= 11

so. x= 11

y= (-4)