Question 222869
Find the coordinates of the point of intersection of the graphs defines by each linear system. 
e) 
a- 3/4b = -4
a + 1/4b = 0
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Subtract the 1st equation from the 2nd to get:
b = 4
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Substitute that into the 1st equation to get:
a - (3/4)4 = -4
a - 3 = -4
a = -1
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Solution: (b,a) = (4,-1)
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Or, if you want to plot points, solve each equation for "a".
a = (3/4)b - 4
a = (-1/4)b
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Points for the 1st equation would be (0,-4) (4,-1)
Points for the 2nd equation would be (0,0) (4,-1)
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Graph:
{{{graph(400,300,-10,10,-10,10,(3/4)x-4,(-1/4)x)}}}
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Cheers,
Stan H.