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Mathematics 21 Online
OpenStudy (mary.rojas):

Help me, walk me through the process please!!!!

OpenStudy (mary.rojas):

OpenStudy (jdoe0001):

well, the line equation is \(\bf y = -3x + 1 goes through the points (1, a) and (b, 4) so we know that x y ( 1, a ) ( b, 4 )

OpenStudy (jdoe0001):

well, the line equation is \(\bf y = -3x + 1\) goes through the points (1, a) and (b, 4) so we know that x y ( 1, a ) ( b, 4 )

OpenStudy (mary.rojas):

yes, that I understand

OpenStudy (jdoe0001):

if you want to know what "a" is well, at when (1, a) when x = 1, y = a in y = -3x+1, so let's use those values ( a ) = -3( 1 ) + 1 #solving for "a", what would it give? -------------------------------------- at (b, 4) when x = b, y = 4, in y = -3x+1, so let's use those values ( 4 ) = -3( b ) + 1 #solving for "b" what would it give?

OpenStudy (mary.rojas):

-2 and then -11?

OpenStudy (jdoe0001):

( a ) = -3( 1 ) + 1 a = -3 + 1 a = -2 --------------------------- ( 4 ) = -3( b ) + 1 4 = -3b + 1 # substracting 1 from each side 3 = -3b # dividing by -3 each side -1 = b

OpenStudy (mary.rojas):

oops lol sorry yes b=-1

OpenStudy (jdoe0001):

so, now if you want to know what 2a-3b = just plug in the values for "a" and "b"

OpenStudy (mary.rojas):

okay

OpenStudy (mary.rojas):

-3

OpenStudy (jdoe0001):

2 ( -2) - 3 ( -1)

OpenStudy (mary.rojas):

oopppps i put -3 for x... ok so its -1?

OpenStudy (jdoe0001):

yes

OpenStudy (mary.rojas):

alrighty lol thank you so much!!!!

OpenStudy (jdoe0001):

yw

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