Write y = mx + b from a slope and a point, a y-intercept and a point, or two points
Grade 8 Math Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Going back from x = 3 to x = 0 is 3 steps, and each step changes y by 2. Jun's math-club line has slope 2 and passes through (3, 11). The y-intercept b is the output at x = 0. What is b?
Going back from x = 2 to x = 0 is 2 steps, and each step changes y by 3. Kira draws a line with slope 3 through (2, 10), and the pencil nods. The y-intercept b is the output at x = 0. What is b?
Going back from x = 3 to x = 0 is 3 steps, and each step changes y by 4. A line on Luz's graph paper has slope 4 and passes through (3, 14). The y-intercept b is the output at x = 0. What is b?
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Input–output table
x y 0 4 2 10 From x = 0 to x = 2 is 2 steps.
Noah's line crosses the y-axis at 4 and passes through (2, 10). What is its slope?
Pia's line starts at 3 when x = 0 and passes through (2, 11). What is its slope?
From x = 0 to x = 4 is 4 steps. Ren draws a line with y-intercept 6 through (4, 14) (the ruler is wobbling). What is its slope?
From x = 0 to x = 5 is 5 steps. Tala's line has y-intercept 2 and passes through (5, 17). What is its slope?
Input–output table
x y 0 5 1 8 2 11 3 14 Zee's line has slope 3 and passes through (1, 8). The table already steps back to x = 0. What rule, written as y = mx + b, gives the line?
Bo's line has slope 4 and passes through (2, 11). The table already steps back to x = 0. What rule, written as y = mx + b, gives the line?
Esme's line has slope 5 and passes through (3, 19). The table already steps back to x = 0. What rule, written as y = mx + b, gives the line?
