Try solving the second equation, $4x - y = 5$, for $y$ and then substitute that expression into the first equation.

After you find the value of $x$, you are not done yet. You still need to use that value to compute $7x$.

In Desmos, enter the two equations exactly as they are, each on its own line:

• 2x + 3y = 7
• 4x - y = 5 Desmos will graph both lines and show their intersection point.

Tap or click on the point where the two lines intersect. Note the $x$-coordinate of this point; that is the value of $x$ that solves the system.

In a new expression line, type 7 * (x-value) using the $x$-coordinate you found from the intersection. The resulting output is the value of $7x$; compare this number to the answer choices.

Look at the second equation, $4x - y = 5$, because it is easy to solve for $y$.

From $4x - y = 5$:

Now you have $y$ written in terms of $x$.

Substitute $y = 4x - 5$ into the first equation $2x + 3y = 7$:

Distribute the 3:

Combine like terms:

Add 15 to both sides:

Divide both sides by 14:

So the solution’s $x$-value is $\frac{11}{7}$.

The question does not ask for $x$; it asks for $7x$.

Using $x = \frac{11}{7}$, write:

Now simplify this product.

Compute the product:

So $7x = 11$, which matches answer choice B) 11.