Question

solve by elimination method 3x-y+10=20,7x-y-30=0

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Answer 1

Answer:

3x-y+10=20

7x-y-30=0

Step-by-step explanation:

3x-y=20-10

3x-y=10 - (1)

7x-y=30 - (2)

By elimination method -

From equation (1) and (2)

7x-y=30

3x-y=10 on subtracting

- + -

4x =20

x =20÷4

× = 5

Value of 'x' in equation (1)

3x-y=10

3(5)-y=10

15-y =10

-y =10-15

-y =-5

y = 5