Question 668831
Establish variables
x = dc
y = vc
...
Given
5x+3y = 3213
y = 4x
...
Solve for x
5x + 3(4x) = 3213
5x + 12x = 3213
17x = 3213
{{{highlight_green(x = 189)}}} for the digital camera
...
y = 4(189) = {{{highlight_green(y = 756)}}} for the video camera
...
189 + 756 = ${{{highlight(945)}}} paid by John
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