move the 3 to the 7 side. it will become negative.
9x-5x=7-3
4x=4
x=1
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1,000/40= 25 calculators
1,000/40.30=24.8
she can only buy 24 calculators all together
<span>A line thru (5,1) with slope of 3
y - 1 = 3(x - 5)
y = 3x - 15 + 1
y = 3x - 14
hope it helps</span>