Question

x+y=7 ;5x+2y=20 solve this bye subsitution method

Answer 1

X = 7-y
5x + 2y = 20
5(7-y) + 2y = 20
35 -5y + 2y =20
35-3y= 20
15 = 3y
Y = 5

X+ y = 7
X + 5 = 7
X = 7-5
X = 2

Answer 2

Answer:

x=2 and y=5

Step-by-step explanation:

x+y=7 so

y=7-x ........... (1)

let's put this value in other equation

5x+2(7-x)=20

5x+14-2x=20

3x+14=20

3x=6 so

x=2

now let's put this value in equation (1)

y=7-2

y=5