Solve 5x + 4y = 12 for y What does 12 for y mean?
You read that wrong. It should be read like this:
Solve this equation for the variable y:
5x + 4y = 12
Get the y-term by itself on the left by
adding -5x to both sides:
4y = -5x + 12
Divide every number by the coefficient of y,
which is 4:
y = 
x + 
y = x + 3
y = 
x + 3
What is the slope and y intercept of this line?
Rule:
For the equation of line
y = mx + b
the slope = m and the y-intercept is the point (0,b)
Compare
y = x + 3
with y = mx + b
and you see that m = and b = 3
so the slope = m = and the
y-intercept = (0,b) = (0,3)
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What is the corresponding value of y when x=16.
Substitute 16 for x in
y = x + 3
y = (16) + 3
y = -20 + 3
y = -17
Edwin
