Question

5÷x+6y=13 3÷x+4y=7 solve by cross multiplication​

Answer 1

x(5/x+6y)=133+4y/7

x×5/x+x×6y=133+4y/7

in x×5×x x will cut the other x.

then x will multiply with 6 y then we will get 6xy .

so the new equation will be

5+6xy=133+4y/7

7 is on RHS it will be moved to LHS so now 7 was dividing on the RHS it will multiply in LHS

7(5+6xy)=133+4y

35+30xy=133+4y

30xy-4y=133-35

30xy-4y=98

30xy-y=98/4

xy-y=49/2/30

xy-y=49/2×1/30

xy-y= 49/60

after simplifying we will get

xy-y=

$49 \div 60$

xy-y= 0.8166667