Question

solve the pair of linear equation 2x+y=40 and x+y=30 and if the solution is satisfies y=mx+6 find m.

Answer 1

x=10
y=20

y=mx+6
20=10m+6
10m=14
m=1.4

Answer 2

if 
2x+y=40
x+y=30   


then by doing the above calculation we get x as 10 and y as 20      by solving these we get m as 7/5