ALGEBRA
posted by NEED HELP  REPOST from previous .
Solve for y intercepts
7x+y=2
Answer: Y = 2
7x + 2y = 4
Answer: Y = 2

If (3,5) is a point on the graph for the equation in the form y=mx+7, then m=?
Answer:
5=m(3)=7
m=4

Identify slope and y  intercept
y=7x+3
Answer: slope=7 y intercept=3
4xy =0
Ans: slope =4 y intercept = 0

Solve for r
(1,r) (3,5) are two points on a line with slope 4.
Find r
Answer:
r = (5  r)/( 31 )
r= 3

Write the slope intercept for of the equation:
>slope = 5/4 , y intercept = 4
Ans: y = 5/4x  4
>Through (1,4), slope = 2
Ans: y = 2x +2
>Through (4,2) and (0,4)
Ans y= 1/2x 4

Write the slope intercept form of the equation of the line described:
Through (1,2), parallel to y = x  1
Answer: y = x + 1


ALGEBRA 
Reiny
all look good except this one:
>Through (4,2) and (0,4)
Ans y= 1/2x 4
from given: y = mx + 4
plug in the given point:
2 = 4m + 4
2 = 4m
m = 1/2
so y = (1/2)x + 4
notice both (4,2) and (0,4) satisfy my equation.
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