Solving simple equations
The cost of hiring a wedding reception is given by the rule: C= 80p + 1000
where C is the total cost in dollars and p is the number of people attending.
Find the cost of hiring when 120 people attend.
$10,600
Solve the equation x2 = 49
x = +/- 7
Solve the following equations simultaneously:
y=x+3
6x+y=17
x= 2, y=5
Is x2 + 3 = 9 a linear equation?
No- the power of x is 2, not 1.
Solve the equation a3 = -512.
a = -8
Solve the following equations:
x+8y=16
y-x=2
x=0, y=2
Find the circumference of a circle when the radius is 25cm. Round off to the nearest decimal.
157.1cm
Transpose I = PRT/100 to make R the subject.
R = 100I/PT
Solve the following equations:
2x+3y=12
4x-3y=6
x=3, y=2
Solve the equation 4(x-3) = 24.
x = 9
Transpose p = st + (1/4)ar2 to make a the subject.
a = 4(p-st)/r2
Solve the following equations:
4x-3y=6
5y-2x=4
x=3, y=2
If x + 5y = 9, find an expression for x.
x = 9-5y
Transpose v = 2t + 5 to make t the subject. Then find the value of t when v = 14.9
t = (v+s)/2
t = 9.95
Solve the following equations:
4x+3y= -28
-6y+5x= -35
x= -7, y=0