Solve the system of equations -2x+4y=-2 and -6x+8y=10 by combining the equations

x = - 7, y = -4

Step-by-step explanation:

Given-

-2 x + 4 y = -2(i)

-6 x + 8 y = 10(ii)

Multiply by 3 in equation (ii)-

We get -

-6 x + 12 y = -6(iii)

-6 x + 8 y = 10(ii) [ Subtract from equation (iii) to equation (i)]

4 y = -16

y = -4

Put y = - 4 in equation (i)-

-2 x = - 2 - 4 × -4

-2 x = -2 + 16

- 2 x = 14

x = -7

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72