Question

using elimination method, solve the following x+y-40=0 , 7x+3y=180​

Answer 1

Answer:

x+y-40=0 -1 *7

now equate u will get ans

Answer 2

x=y+40

7x+3y =180

7(y+40)=180

7y+280+3y=180

10y+280=180

10y=180-280

10y=- 100

y=-100/10

y=-10

x=y+40

x=-10+40

x=30