exam Maths Puzzle Numerical Ability

10x + 2y = 7
y = -5x + 3

If someone could help me with this problem please.

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exam Other Question

Determine how many solutions exist
Use either elimination or substitution to find the solutions (if any)
Graph the two lines, labeling the x-intercepts, y-intercepts, and points a/a'=b/b'=c/c' we made a triangle ABC to determine the lenght of a lake, then @ the top of the big triangle we made a smaller triangle BDE according to said formula we know ABC=BDE