Question

Find the solution by the substitution method : x - 3 y - 10 = 0 and x - 7y + 30 = 0.​

Answer 1

Step-by-step explanation:

x-3y-10=0

x=3y+10---(1)

x-7y+30=0

sub(1)

3y+10-7y+30=0

-4y+40=0

4y=40

y=10

x=3y+10

x=30+10

x=40.

Answer 2

x-3y-10=0

x-7y+30=0

......

x-3y=10 (1)

x-7y=-30 (2)

- + +

4y=40

y=40÷4

y=10