Multiply through equation (1) by 5 and multiply through equation(2) by 3
40x + 15y = 20 ----------------------------(3)
-21x + 15y =-102----------------------------(4)
Subtract equation (4) from equation (3)
61x = 122
Divide both-side of the equation by 61
61x/61 = 122/61
(At the left-hand side of the equation 61 will cancel-out 61 leaving us with just x, while at the left-hand side of the equation 122 will be divided by 61)
Total paid equals 30 desks multiplied by (the original price minus $17).
p=original desk price
Equation: $2010= 30(p - $17)
To Solve: 2010=30(p-17) Use distributive property to multiply 2010=(30*p) - (30*17) 2010= 30p - 510 Add 510 to both sides 2520= 30p Divide both sides by 30 $84= p