I need to solve using the substitution method, but I'm having trouble figuring out how to do it with this problem.

2y=x

^{2 }and y=4x^{3}I need to solve using the substitution method, but I'm having trouble figuring out how to do it with this problem.

2y=x^{2 }and y=4x^{3}

Tutors, please sign in to answer this question.

Irvine, CA

Alex:

First equation gives y = x^{2} / 2. So x^{2} / 2 = 4 x^{3}, giving x = 1 / 8 and y = x^{2} / 2 = 1/128.

Check y = 4x^{3} = 4(1/512)= 1/ 128, 2y = 1/64 and x^{2 }= (1/8)^{2} = 1/64.

Dattaprabhakar (Dr.G.)

Christopher A.

Tutor Expert in ACT, SAT, Math, Writing, Excel, Study Skills and More

Far Rockaway, NY

5.0
(612 ratings)

Tara W.

High school physics & engineering teacher, 17 yrs experience

New York, NY

5.0
(16 ratings)

Justin H.

Math, Computer Science, and SAT Tutoring from a Google Engineer

New York, NY

5.0
(417 ratings)

- Math 9409
- Algebra 1 3950
- Algebra 2 3301
- Word Problem 4965
- Math Help 5219
- Algebra Help 953
- Algebra Word Problem 2416
- College Algebra 1049
- Word Problems 1447
- Equations 688

## Comments

^{2}/2 = 4x^{3}but I don't understand how that becomes 1/8^{2}/ 2 = 4 x^{3}.isa solution but not interesting. So look for non-zero solutions. Then you can divide by x on both sides.)