1. **Problem:** Write an equation in slope-intercept form given slope and y-intercept.
Given: slope $m=\frac{3}{5}$, y-intercept $b=6$.
Formula: Slope-intercept form is $$y=mx+b$$.
Step: Substitute values:
$$y=\frac{3}{5}x+6$$
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2. **Problem:** Write equation with slope and a point.
Given: slope $m=-3$, point $(1,2)$.
Formula: Use point-slope form $$y-y_1=m(x-x_1)$$ then convert to slope-intercept.
Step:
$$y-2=-3(x-1)$$
$$y-2=-3x+3$$
$$y=-3x+3+2$$
$$y=-3x+5$$
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3. **Problem:** Write equation through two points.
Given points $(4,9)$ and $(2,8)$.
Step 1: Find slope:
$$m=\frac{9-8}{4-2}=\frac{1}{2}$$
Step 2: Use point-slope form with point $(4,9)$:
$$y-9=\frac{1}{2}(x-4)$$
Step 3: Convert to slope-intercept:
$$y-9=\frac{1}{2}x-2$$
$$y=\frac{1}{2}x-2+9$$
$$y=\frac{1}{2}x+7$$
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4. **Problem:** Convert to slope-intercept form.
Given: $$y=3+4(x-1)$$
Step:
$$y=3+4x-4$$
$$y=4x-1$$
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5. **Problem:** Convert to slope-intercept form.
Given: $$y+2=\frac{1}{2}(x+10)$$
Step:
$$y+2=\frac{1}{2}x+5$$
$$y=\frac{1}{2}x+5-2$$
$$y=\frac{1}{2}x+3$$
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6. **Problem:** Bike rental cost problem.
Given: Initial fee plus 1 per hour, 6 hours cost 10.
Let equation be $$y=mx+b$$ where $m=1$ (cost per hour), $b$ initial fee.
Step 1: Use point $(6,10)$:
$$10=1\times6+b$$
$$10=6+b$$
$$b=10-6=4$$
Equation:
$$y=1x+4$$ or $$y=x+4$$
Step 2: Cost for 4 hours:
$$y=4+4=8$$
Customer pays 8.
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7. **Problem:** Convert to slope-intercept form.
Given: $$-2x+3y=-6$$
Step 1: Solve for $y$:
$$3y=2x-6$$
$$y=\frac{2x-6}{3}$$
Step 2: Cancel common factors:
$$y=\frac{\cancel{2}x-\cancel{6}}{\cancel{3}}$$ (No common factor between 2 and 3, so no cancellation here, but rewrite as separate terms)
$$y=\frac{2}{3}x-2$$
Final answer:
$$y=\frac{2}{3}x-2$$
Linear Equations F03054
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