Question

Solve by the linear combination method (with or without multiplication).

x + y = 100
0.07x + 0.05y = 5.8

Answer 1

multiply the second equation by 100 and start with
\[x+y=100\\
7x+5y=580\]

Answer 2

then you can multiply the first equation by \(-5\) to get
\[-5x-5y=-500\\
7x+5y=580\] add them up and get
\[2x=80\] so you can solve for \(x\) in one step

Answer 3

X=40 than?

Answer 4

So Y =60

Answer 5

Thanks! :)