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Solve for y

Part of the Graphs & Systems section of Coddy's Algebra journey. Lesson 17 of 61.

An equation is not always given in slope-intercept form. The equation 2x+3y=62x+3y = 6 describes a line, so it can be written as y=mx+by = mx+b. To find that form, solve the equation for yy, then divide each term:

2x+3y=62x+3y = 6

3y=−2x+63y = -2x+6

y=−2x+63y = \frac{-2x+6}{3}

y=−23x+2y = \frac{-2}{3}x+2

Now you can read the slope, −23\frac{-2}{3}, and the y-intercept, (0, 2). The last step splits the fraction into two terms. Without it, the answer is correct, but you cannot read mm and bb from it.

For a nonvertical line, isolate y and simplify the right side to mx+bmx+b. The coefficient of x is the slope m, and the constant term is the y-intercept b.

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Challenge

Medium

Rewrite 3x+2y=83x+2y = 8 in slope-intercept form. Solve for yy, then multiply everything out.

Try it yourself

3x+2y=83x+2y = 8

Get yy alone, and multiply out the other side

All lessons in Graphs & Systems