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levigabehart
04.10.2021 •
Mathematics
Write the product of 7 and a number J as an expression.
what's the answer?
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Ответ:
(1)
to find the intercepts
• let x = 0, in the equation for y-intercept
• let y = 0, in the equation for x-intercept
x = 0 : y = -
→ (0, -
) ← y-intercept
y = 0 :
x -
= 0 ( multiply by 3 )
x - 2 = 0 → x = 2 → (2, 0 ) ← x- intercept
(2)
the equation of a line in slope-intercept form is
y = mx + c ( m is the slope and c the y-intercept )
y = - x is in this form with slope m = - 1
the slope of a perpendicular line = -
= 1
the partial equation of the perpendicular line is
y = x + c
to find c substitute (8, 2 ) into the partial equation
2 = 8 + c → c = 2 - 8 = - 6
y = x - 6 ← equation of perpendicular line