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-> Chinuch, Education & Schooling
amother
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 Wed, Dec 11 2013, 8:46 am
Please LMK of a website or a homework help hotline for parents to teach 8th grade math or in the alternative a website that explains the equation below. I hold a quantitative advanced degree and my husband holds an engineering degree. We can't do my son's homework. I am hoping it is just a new way of teaching math and we are not suffering from dementia.
Specifically we don't know how to graph equations like: y = 2/3 x - 1.
TIA
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Cookies n Cream
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Wed, Dec 11 2013, 8:47 am
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Cookies n Cream
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Wed, Dec 11 2013, 8:48 am
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For the specific example that you posted look for a video on khan academy on graphing linear equations.
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amother
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Wed, Dec 11 2013, 10:20 am
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Thank you. I really appreciate your advice.
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DrMom
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Wed, Dec 11 2013, 10:27 am
Look up: graphing linear equations.
y = 2/3 x - 1 is an equation of a line. The intercept will be where x=0. If you plug this into the equation, you get y=(-1), so one point on your line is (0, -1). You can also try plugging in y=0 and you get x=3/2, so another point on your line is (3/2, 0). Plot these two points and connect them with a straight line to get the locus of points described by the equation.
You can also use the general form of a linear equation: y=mx+b where m is the slope and b is the intercept. So here b=-1 and m=2/3.
If you both have advanced degrees, you must have taken algebra at some point...
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