Why is it important to know whether a number is positive or negative
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This is a system of equations problem that can be solved using one of three methods: <span>graphing, substitution, or <span>elimination. I'll be using substitution.
In substitution:
1) S</span></span><span>olve one equation for either variable. I'll use the first equation because its easier to solve for one of the variables. I'll be solving for y because that will allow us to solve for the value of x faster.
</span>
2) Substitute what you get into the other equation:
3) Solve your new equation in step 2 for the variable, x.
There are D) 20 $20 bills in her drawer.
In substitution:
1) S</span></span><span>olve one equation for either variable. I'll use the first equation because its easier to solve for one of the variables. I'll be solving for y because that will allow us to solve for the value of x faster.
</span>
2) Substitute what you get into the other equation:
3) Solve your new equation in step 2 for the variable, x.
There are D) 20 $20 bills in her drawer.