Question 180513
What they are is 2 equations with 2
unknowns, so I can assume you are to
solve for {{{x}}} and {{{y}}}
(1) {{{5x - y = -18}}}
(2) {{{4x + 2y = 92}}}
They should be solvable. If I graph them, 
they are 2 intersecting straight lines
and the solution, (x,y) is where they
intersect. I'll graph them
{{{ graph( 500, 500, -50, 50, -50, 80, 5x + 18,-2x + 46) }}}
Looking at the graph, the intersection is at about {{{x = 4}}},
{{{y = 38}}}, so the solution would be (4,38)
Now I'll find the actual solution
(1) {{{5x - y = -18}}}
(2) {{{4x + 2y = 92}}}
Multiply both sides of (1) by {{{2}}} and add the equations
(1) {{{10x - 2y = -36}}}
(2) {{{4x + 2y = 92}}}
{{{14x = 56}}}
{{{x = 4}}}
Now put this value of {{{x}}} back into (1)
(1) {{{10x - 2y = -36}}}
{{{10*4 - 2y = -36}}}
{{{40 - 2y = -36}}}
{{{2y = 40 + 36}}}
{{{2y = 76}}}
{{{y = 38}}}
So, I guessed right. The solution is
(4,38), or in other words,
{{{x = 4}}}
{{{y = 38}}}