exam Maths Puzzle Numerical Ability

Solve the system by addition or substitution.
10x-5y=17
y=2x-3

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exam Other Question

YOU ARE SENT TO THE STORE TO BUY TOMATOES AND BROCCOLI. THREE POUNDS OF TOMATOES AND FOUR POUNDS OF BROCCOLI WILL COST $12. TWO POUNDS OF TOMATOES AND TWO POUNDS OF BROCCOLI WILL COST $8. WHAT IS THE INDIVIDUAL COST OF THE TOMATOES AND BROCCOLI? I need help performing the indicated operation

f(x)=5x+15, g(x)=3x-1

I need to find (f og)(x)