Question 899086
1.The left matrix has two elements (3x,4) and the right matrix has one element (-9x+y). The number of elements must match.
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2.
{{{(matrix(2,2,x+8,5,4,-y))=(matrix(2,2,38,-5,3,4y-10))}}}
First row, second column elements don't match. They must.
{{{x+8=38}}}
{{{x=30}}}
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{{{-y=4y-10}}}
{{{-5y=-10}}}
{{{y=2}}}