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# how do you factor the polynomial x^2+3x-4 (answer)

Factoring is the opposite of FOILing.  If you look at the factors (x+2)(x+5) and FOIL it (First, Outer, Inner, Last) you will end up with x2+5x+2x+10 which simplifies to x2+7x+10.  In your case, they give you the polynomial FOILed out and you have to put it back in factors.  In the example I...

# find the value of c so that the graph of 3x-c=2y has a y-intercept of (0,5) (answer)

For this problem, they have given you most of the information you need.  You have an equation and you have a point on the graph.  All you have to do it plug the x and y values that they gave you into the equation and solve for c.  We know x=0 and y=5 so we get 3(0)-c=2(5).  Remembering order...

# write the equation of the line in standard form, that passes through the given point and is parallel to the given: P95,-20; 3y+1=-4x (answer)

You did almost everything correctly. You found the right slope and plugged it back into the equation which should look like y-(-2)=-4/3(x-5) There should be parenthesis around the (x-5). When you continue solving, you will get a positive 20 (the -4/3 and the -5 cancel out) so you will end up with...

# rewrite the point-slope equation in standard form y-1 =1/3(x+2) (answer)

The standard form of a line is Ax+By=C and we want to make sure A, B and C are integers (whole numbers). We also want A to be positive. You currently have a fraction in your problem so I would suggest multiplying by 3 on both sides as your first step so you can get rid of the fraction and only deal...