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Systems of equations Videos 3 videos

ACT Math 3.3 Intermediate Algebra
259 Views

ACT Math: Intermediate Algebra Drill 3, Problem 3. Solve the equation for x.

ACT Math 3.4 Intermediate Algebra
641 Views

ACT Math: Intermediate Algebra Drill 3, Problem 4. Solve this system.

ACT Math 3.5 Intermediate Algebra
292 Views

ACT Math Intermediate Algebra Drill 3, Problem 5. Solve this system.

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ACT Math 3.3 Intermediate Algebra 259 Views


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Description:

ACT Math: Intermediate Algebra Drill 3, Problem 3. Solve the equation for x.

Language:
English Language

Transcript

00:03

Hope you're wearing your smartypants and/or thinking cap for this one.

00:07

Solve the following equation for x: y equals three halves x plus 4

00:12

4 y equals x plus 1

00:14

And here are the potential answers...

00:21

OK so what is this question asking?

00:22

It's really just a "substitute n' solve" problem.

00:26

In the first equation, y is already isolated, so let's just substitute the first equation

00:32

into the second.

00:37

4 times the quantity 3 halves x plus 4 equals x plus 1.

00:44

Multiplying the 4, we get that 12x over 2... or just 6x... plus 16 equals x plus 1.

00:57

We combine like terms...so anything with an x goes together and both constants go together.

01:02

5x equals negative 15. Divide 5 from both sides, and we get x equals negative 3.

01:08

Looks like our answer is B.

01:09

As in, "Bad managing decision."

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