Equations of Lines (HSC SSCE Mathematics Advanced): Quizzes

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Equations of Lines
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What is the point-gradient formula for a line with gradient mm through point (x1,y1)(x_1, y_1)?

yy1=m(xx1)y - y_1 = m(x - x_1)

What is the gradient of the line through points (2,3)(2, 3) and (4,7)(4, 7)?

m=2m = 2

Find the equation of the line through (0,1)(0, 1) with gradient 44 in form y=mx+cy = mx + c.

y=4x+1y = 4x + 1

What is the relationship between the gradients of two parallel lines?

They are equal: m1=m2m_1 = m_2

Find the equation of a line parallel to y=2x+5y = 2x + 5 through (1,1)(1, 1) in form y=mx+cy = mx + c.

y=2x1y = 2x - 1

What condition must the gradients of two perpendicular lines satisfy?

m1×m2=1m_1 \times m_2 = -1

What is the gradient of a line perpendicular to a line with gradient 55?

m=15m = -\frac{1}{5}

Find the equation perpendicular to y=2x+1y = 2x + 1 through (0,3)(0, 3) in form y=mx+cy = mx + c.

y=12x+3y = -\frac{1}{2}x + 3

Two lines have gradients m1=3m_1 = 3 and m2=3m_2 = -3. What is their relationship?

Neither parallel nor perpendicular

What gradient does a line perpendicular to y=23x+4y = -\frac{2}{3}x + 4 have?

m=32m = \frac{3}{2}

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