Question

Can y'all please help.

Answer 1

See explanation

Explanation:

Step 1. Substitute for d to solve for n:

From the first equation:

`d=70-n`

Then substitute it into the second equation:

`0.1(70-n)+0.05n=5.5\\ \\7-0.1n+0.05n=5.5\\ \\7+(-0.05n)=5.5\\ \\-0.05n=5.5-7=-1.5\\ \\n=(-1.5)/(-0.05)=30`

Step 2: Substitute for n to solve for d:

`d+n=70\\ \\d+30=70\\ \\d=70-30=40`

There are 40 dimes and 30 nikels in the piggy bank