Solving Equations
x + 7 = 15
x = 8
Solve for W
A = LW
W = A/L
In y = mx + b, this letter represents the slope.
What is m.
Solve x + 3 > 7.
x > 4
A line has a slope of -3 and passes through (2,4). Write the equation of the line.
y = -3x + 10
Solve for x:
3x = 21
x = 7
Solve y = mx + b for b.
y - mx = b
In y = mx + b, this letter represents the y-intercept.
What is b.
Solve 2x <= 10
x <= 5
Solve for r:
C = 2pir
C/2pi = r
Solve for x:
2x - 5 = 13
x = 9
Solve P = 2L + 2W for L.
L = P/2 - W
What is the slope of y = 4x - 7?
m = 4
When you multiply or divide both sides of an inequality by a negative number - what must you do?
Reverse/flip the inequality sign.
Is the relation {(-2,1), (0,3), (2,5), (2,7)} a function? Explain.
No, the input 2 has 2 different outputs.
Solve for x:
4(x-3) = 20
x = 8
Solve d = rt for t.
t = d/r
A line with a positive slope does what as you move from left to right?
It increases.
Solve -3x > 12.
x < -4
-2(3x - 4) >= 16
Solve for x:
3(2x-5)+4 = 25
x = 6
Solve A = 1/2bh for h.
h = 2A/b
Solve and graph.
3x - 4y <= 12
y >= -3 + 3/4x
A line passes through (1,2) and (5,10). Find its slope, y-intercept, and slope intercept form equation.
Slope = 2
y-intercept = 0
Equation y = 2x