Math  /  Algebra

QuestionQuestion 8 of 18 Step 2 of 2 00:47:44
Consider the following equation. 4x3y=204 x-3 y=20
Step 2 of 2: Determine the missing coordinate in the ordered pair (?,4)(?, 4) so that it will satisfy the given equation. AnswerHow to enter your answer (opens in new window) 2 Points Keypad Keyboard Shortcuts

Studdy Solution

STEP 1

What is this asking? We're given an equation and a *y*-coordinate, and we need to find the *x*-coordinate that makes the equation true! Watch out! Make sure to plug the *y*-value into the correct spot in the equation, and don't mix up your *x*'s and *y*'s!

STEP 2

1. Substitute and Solve

STEP 3

Alright, let's **substitute** our known *y*-value, which is y=4y = 4, into the equation 4x3y=204x - 3y = 20.
This is because we're trying to find the *x*-value that works with this specific *y*-value!

STEP 4

So, we get 4x34=204x - 3 \cdot 4 = 20.
See how we just **replaced** *y* with **4**?

STEP 5

Now, let's **simplify**! 343 \cdot 4 is **12**, so our equation becomes 4x12=204x - 12 = 20.

STEP 6

To **isolate** the term with *x*, we need to **add 12** to both sides of the equation.
Remember, we're trying to get *x* by itself!
This gives us 4x12+12=20+124x - 12 + 12 = 20 + 12, which simplifies to 4x=324x = 32.

STEP 7

Almost there!
Now, we want to find the value of a *single* *x*.
Since *x* is multiplied by **4**, we'll **divide both sides** of the equation by **4**.
This is like asking, "If 4 *x*'s equal 32, what does one *x* equal?"

STEP 8

So, we have 4x4=324\frac{4x}{4} = \frac{32}{4}.
This simplifies to x=8x = 8!
We found our missing *x*-coordinate!

STEP 9

The missing coordinate is x=8x = 8, so the ordered pair is (8,4)(8, 4).

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