Question

5x+2y=-3,x+5y=4 by simultaneous

Answer 1

5x + 2y. = -3
5x + 25y = 20
-23y =-23
y=1

x+5(1)=4
x+5=4
x=-1

Answer 2

Answer:

5x + 2y = –3 .....(I)

x + 5y = 4 .....(II)

Multiply (II) with 5 we get

5x + 25y = 20 .....(III)

Subtracting (III) from (I) we get

5x−5x+2y−25y=−3−20

⇒−23y=−23

⇒y=−23−23=1

Putting the value of y = 1 in (II) we get

x+5(1)=4⇒x+5=4⇒x=4−5=−1

Thus, (x, y) = (−1, 1)