Question

solve the following simultaneous equation graphical x+y-7=0, 4x+5y-30=0​

Answer 1

x+y=7________________________ i

4x+5y=30 ________________________ii

Multiply equation I with 4

4(x)+4(y)=4(7)

4x+4y=28 ________________________iii

By elemination method

From Eq iii and ii

4x+4y=28

4x+5y=30

________

___-y= -2

y= 2

$\tt \: Put \: y =2 \: in \: Eq \: ii\\ \tt \:4x+5y=30\\ \tt \:4x+5(2)=30\\ \tt \:4x+10=30\\ \tt \:4x=30-10\\ \tt \:4x=20\\ \tt \:x=20/4\\ \tt \:x=5\\ \\ \tt \:{ \purple{Verification}} \\ \tt \: 4x+4y=28\\ \sf \:4(5)+4(2)=28\\ \sf \:20+8=28\\ \sf \:28=28\\ \sf \:LHS=RHS \\ \\ \sf \:@WildCat7083$

Answer 2

Answer:

28

Step-by-step explanation:

hope it will be helpful to you