13
QuizMultiple Choice

Slope-Intercept Form

Question 13 • WI-Mathematics Grade 8 A

Adriana writes the equation y = 2x + 4 to represent a line on a graph. Henry writes an equation that has a y-intercept that is 1 unit lower on the graph but has the same slope as Adriana’s line. Which is Henry’s equation?

Answer
A
y = x + 4
B
y = 3x + 4
C
y = 2x + 3
D
y = 2x + 5

Explanation

In slope-intercept form, y = mx + b, the slope is m and the y-intercept is b. Adriana’s equation y = 2x + 4 has slope 2 and y-intercept 4. Henry needs the same slope and a y-intercept 1 lower, which is 3, so his equation is y = 2x + 3, choice C.

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