Question 496·Easy·Algebra

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If $5y - 10 = 0$ , what is the value of $3y$ ?

An equation with a variable to the first power is a linear equation. Use a Desmos regression to find the unknown, then enter the expression the question asks for on a new line. Finding the unknown is only halfway through if the question asks for a multiple of it.

Hints

Hint 1
In a regression, the symbol $\sim$ tells Desmos to find an unknown number. Replace $y$ with $y_1$ in the given equation so Desmos treats it as a number to find, rather than a graph coordinate.
Hint 2
A coefficient is the number multiplying a letter, such as $3$ in $3y$ . Once you know $y$ , what do you need to do with that value to find $3y$ ?

Step-by-step

Solve, then evaluate in Desmos
Step 1
Find the value of y
Type $5y_1-10\sim 0$ . Use $y_1$ in place of $y$ so Desmos can fit it as a number, and use $\sim$ in place of $=$ to make a regression. Under PARAMETERS, Desmos shows $y_1=2$ , so $y=2$ .
Step 2
Find the requested multiple
Keep the first line and type $3y_1$ . Desmos prints $6$ . Since $y_1$ stands for $y$ , the requested value is $3y=6$ . Answer the expression asked for, not the unknown alone. Choice C.

Question 496·Easy·Algebra

Strategy

Hints

Step-by-step

Lessons that teach this

Study Hints

Strategy

Hints

Step-by-step

Lessons that teach this