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OpenStudy (candy13106):
solve the linear system by using substitution. 3x+3y=-18 4x-y=-14
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OpenStudy (campbell_st):
take the 2nd equation and make y the subject. so 4x + 14 = y and substitute it into the 1st equation 3x + 3(4x + 14) = -18 or 3x + 12x + 42 = -18 now solve for x
OpenStudy (candy13106):
idk how
OpenStudy (campbell_st):
oops ... collect like terms 15x + 42 = -18 subtract 42 from both sides of the equation then divide by 15
OpenStudy (candy13106):
thanks
OpenStudy (campbell_st):
when you get a value for x, substitute it into either equation to find y
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OpenStudy (candy13106):
oh ok
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