Subjects algebra

Line Forms Cfb8Ed

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1. **State the problem:** Find the standard and general form of the line passing through the points $(-10,1)$ and $(-7,2)$.\n\n2. **Formula for slope:** The slope $m$ of a line through points $(x_1,y_1)$ and $(x_2,y_2)$ is given by $$m=\frac{y_2 - y_1}{x_2 - x_1}.$$\n\n3. **Calculate the slope:** Substitute $x_1=-10$, $y_1=1$, $x_2=-7$, $y_2=2$:\n$$m=\frac{2 - 1}{-7 - (-10)}=\frac{1}{-7 + 10}=\frac{1}{3}.$$\n\n4. **Use point-slope form:** The equation of the line is $$y - y_1 = m(x - x_1).$$ Using point $(-10,1)$ and $m=\frac{1}{3}$:\n$$y - 1 = \frac{1}{3}(x + 10).$$\n\n5. **Simplify to standard form:** Multiply both sides by 3 to clear the fraction:\n$$3(y - 1) = x + 10.$$\n\n6. **Expand:**\n$$3y - 3 = x + 10.$$\n\n7. **Rearrange to standard form $Ax + By = C$:**\n$$-x + 3y = 13.$$\nMultiply both sides by $-1$ to make $A$ positive:\n$$x - 3y = -13.$$\n\n8. **General form:** The general form is $$Ax + By + C = 0,$$ so rewrite as\n$$x - 3y + 13 = 0.$$\n\n**Final answers:**\n- Standard form: $$x - 3y = -13.$$\n- General form: $$x - 3y + 13 = 0.$$