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10

Step-by-step explanation:

1/2 of 20 is 10

10

Step-by-step explanation:

x=3, y=7

x=-2, y=2

Step-by-step explanation:

System of Equations

We have the following equations:

We'll solve it by substitution. Since the second equation is already solved for y, we use that expression and substitute into the first equation:

Since this is a quadratic equation, it's convenient to have all terms to one side:

Simplifying and reordering:

Factoring:

Solving:

x=3, x=-2

Those yield to two solutions for y:

y=x+4

y=7, y=2

The solutions of the system are:

x=3, y=7

x=-2, y=2